Pittsburgh Steelers wide receiver Lynn Swann goes up to make a catch over Dallas Cowboys cornerback Mark Washington in the Steelers 21-17 win over the Cowboys in Super Bowl X on January 18, 1976 at the Orange Bowl in Miami, Florida. (National Football League)

San Francisco 49ers coach Dick Nolan, center, reacts as the team intercepts a pass from the Dallas Cowboys during their football game in Irving, Texas on Nov. 24, 1972. (AP Photo)

Quarterback Steve Spurrier #11 of the Tampa Bay Buccaneers eludes defensive end Bob Lurstema #70 of the Seattle Seahawks at Tampa Stadium on October 17, 1976 in Tampa, Florida. The Seahawks defeated the Buccaneers 13-10. (National Football League)

Hall of Fame quarterback Johnny Unitas drops back to pass in a Baltimore Colts 35-20 win over the New York Jets on Dec. 19, 1970 at Memorial Stadium. (National Football League)

Atlanta Falcons defensive end Claude Humphrey in action during a 10-0 loss to the Los Angeles Rams on September 10, 1978 at Los Angeles Memorial Coliseum in Los Angeles, California. Atlanta Falcons vs Los Angeles Rams - September 10, 1978 (National Football League)

Pittsburgh Steeler Hall of Fame running back Franco Harris (32) on a run in a 16-6 win over the Minnesota Vikings in Super Bowl IX on January 12, 1975 at Tulane Stadium in New Orleans, Loiusiana. (National Football League)

Los Angeles Rams defensive tackle Coy Bacon and defensive end Larry Brooks chase Falcons running back Dave Hampton in a 20 to 7 win over the Atlanta Falcons on November 5, 1972 at the Los Angeles Memorial Coliseum in Los Angeles, California. Los Angeles Rams 1970's - File Photos (National Football League)

Cincinnati Bengals running back Fred Willis (33) gets upended by Los Angeles Rams defensive backs Ken Geddes (36) and Dave Edmendorf (42) during a 15-12 Rams victory on October 22, 1972, at the Los Angeles Memorial Coliseum in Los Angeles, California. (National Football League)

Los Angeles Rams defensive tackles Coy Bacon (79) and Hall of Famer Merlin Olsen (74) sandwich Atlanta Falcons running back Dave Hampton (43) during a 20-7 Rams victory on November 5, 1972, at the Los Angeles Memorial Coliseum in Los Angeles, California. (National Football League)

Los Angeles Rams defensive tackle Cody Jones (76) hits Saints running back Chuck Muncie (42) driving him backward during the Rams 14-7 victory over the New Orleans Saints on October 16, 1977 at the Los Angeles Memorial Coliseum in Los Angeles, California. (National Football League)

Oakland Raiders defensive tackle Tom Keating in 1970. (National Football League)

Dallas running back Duane Thomas is stopped by Miami tacklers after picking up a short gain during the Super Bowl game in New Orleans, Jan. 16, 1972. Miami tacklers are, from left, Doug Swift, Nick Buoniconti and Manny Fernandez. (AP Photo)

Dallas Cowboys Hall of Fame quarterback Roger Staubach (12) throws a pass during game against the Los Angeles Rams in Los Angeles, Oct. 14, 1973. The Rams defeated the Cowboys 37-31 at the Los Angeles Coliseum. (National Football League)

Washington Redskins Hall of Fame defensive end David "Deacon" Jones (75) pressures Dallas Cowboys Hall of Fame quarterback Roger Staubach (12) during game in Los Angeles, Nov. 17, 1974. The Redskins defeated the Cowboys 28-21 at RFK Stadium. (National Football League)

Pittsburgh Steelers' Mel Blount (47) hauls in Houston Oilers running back Earl Campbell (34) for no gain in the second quarter of the NFL game at Houston Monday, Dec. 11, 1979. (AP Photo)

Kansas City quarterback Len Dawson is grabbed by a Minnesota defender after handing off to running back Mike Garett during first half action in the Super Bowl in New Orleans on Jan. 11, 1970. Garrett scored a touchdown on the play. (AP Photo)

Green Bay Packers quarterback David Whitehurst (17) scores on a 3-yard run during an NFL game against the Minnesota Vikings in Green Bay, Nov. 27, 1977. The Vikings defeated the Packers 13-7. (AP Photo/Vernon Biever)

Buffalo Bills' O.J. Simpson rushes through a large hole in the center of the Detroit Lions defensive line to score on a 12-yard run for his second touchdown of the game in an NFL football game in Pontiac, Michigan on Nov. 25, 1976. (AP Photo)

Minnesota Vikings' Chuck Foreman (44) goes over the top to score from the one yard line during the third quarter of game against the Chicago Bears in Chicago, Sept. 26, 1978. (AP Photo/Larry Stddard)

Oakland Raiders' Daryle Lamonica (3) is rushed by New York Jets' Mark Lomas (34) and Gerry Philbin (81) in first quarter incomplete pass play in New York's Shea Stadium, Dec. 6, 1970. Other Oakland players are Art Shell (78) and Jim Otto (00). (AP Photo/Harry Harris)

Minnesota defensive back Earsell Mackbee knocks down a pass intended for Kansas City receiver Otis Taylor, who loses his shoe, during the first half of Super Bowl IV, Jan. 11, 1970, in New Orleans. (AP Photo/JS)

Quarterback Terry Bradshaw, pro football's top draft choice, signed a multi-year contract with the Pittsburgh Steelers in Pittsburgh, April 26, 1970. (AP Photo)

Cincinnati Bengals Jess Phillips leaped over a jam of players to score a touchdown in first quarter of a NFL exhibition game against the Washington Redskins on Saturday, August 8, 1970in Cincinnati. Other Bengal is Rufus Mayes (71) while Redskins Leo Carroll is a lower left. (AP Photo/GS)

Houston Oilers Ken Houston (29) takes a lateral from teammate Ron Pritchard (58), a linebacker, who intercepted pass by Pittsburgh Steelers quarterback Terry Bradshaw (12). Play came in second quarter of game in Pittsburgh in afternoon on Sunday, Sept. 20, 1970. Houston (29) took ball to Steelers 13 yards line. Oilers scored their second touchdown of the day on next series of downs. (AP Photo)

Cleveland Browns defensive ends Jack Gregory (81) and Ron Snidow (88) blast through the New York Jets protection and nab quarterback Joe Namath in the second quarter of their game in Cleveland, Ohio Sept 21, 1970. (AP Photo)

St. Louis Cardinals MacArthur Lane (36) leaps over center in an attempt to get the 1 yard for a first down during the first quarter game on Sept. 27, 1970 at St. Louis. Lane came up about 3 inches short of the first down but a quarterback sneak by Cardinals Jim Hart made it on the next play. Washington Redskins Mike Bass moves in to make the stop on Lane. (AP Photo/Fow)

Charley Harraway, 31, of the Washington Redskins carries for four yards in the second period. Detroit players include Wayne Rasmussen, 47; Alex Karras, 71; Lem Barney, 20, and Wayne Walker, 55. No. 56 is Len Hauss on Oct. 11, 1970 in Washington. (AP Photo)

Atlanta running back Harmond Wages dives over the goal from the one foot line to give the Falcons their first TD against the New Orleans Saints in Atlanta on Sunday, Oct. 25, 1970. Trying to stop the flight of the flying Falcon is the Saint?s middle line backer Dick Absher, (53). (AP Photo/BH)

Boston tight end Barry Brown receives a pass in the second quarter of game with the Baltimore Colts, but failed to make any gain in Baltimore, Maryland on Oct. 25, 1970. Charging up from the rear is Tom Maxwell of the Colts. The Baltimore team won 27-3. (AP Photo)

Green Bay Packer corner back Ken Ellis (48) goes high as he returns a 49er punt in third quarter action on Sunday, Nov. 2, 1970 at San Francisco. Packer guard at right is Forrest Gregg (75). The 49ers took the Packers, 26-10. (AP Photo)

Detroit Lions running back Mel Farr (24) hops over defensive end Richard Neal (87) of the New Orleans Saints to go in for a touchdown on Sunday, Nov. 8, 1970 in New Orleans. Farr took a handoff from quarterback Bill Munson for the score. (AP Photo/JTR)

Patriots runningback Jim Nance (35) squeezes between San Diego defenders Jim Tolbert (43) and Tom Williams (87) to score Boston's first touchdown in the first period of their NFL game in Haryard Stadium, Cambridge on Sunday afternoon, Nov. 15, 1970. The Chargers scored twice in the second half to top the Patriots, 16-15. (AP Photo)

Kansas City's quarterback Len Dawson pin-points his receiver as he gets set to pass in the game with the St. Louis Cardinals in Kansas City, on Nov. 23, 1970. The game was played to a 6-6 tie. (AP Photo/WPS)

Houston Oilers running back Joe Dawkins (34) got all wrapped up by Denvers Pete Duranko (55) and Fred Forsberg (52) as he picked up one yard at his right tackle slot during first quarter play at the Houston Astrodome, Sunday, Nov. 30, 1970, Houston, Tex. Houston won the game 31-21. The rest of the players are unidentified. (AP Photo/Ed Kolenovsky)

Raiders wide receiver Rod Sherman (13) reaches up and grabs a Daryle Lamonica pass in the fourth quarter that became an 87-yard touchdown play, Dec. 28, 1970, Oakland, Calif. It was Oaklands third touchdown and gave Raiders a 21-14 American Football Conference victory over the Miami Dolphins. At left is cornerback Curtis Johnson (45) of the Dolphins. (AP Photo)

Miami Dolphins Coach Don Shula, left, embraces Pittsburgh Steelers Coach Chuck Noll on Jan. 1, 1972 in Pittsburgh, as the scoreboard behind them tells of the Dolphins 21-17 win over the Steelers for the American Football Conference championship. (AP Photo)

Dallas Cowboys coach Tom Landry is carried off the field on the shoulders of his players after they defeated Miami Dophins 24-3 to win Super Bowl VI in New Orleans, La., Sunday, Jan. 16, 1972. The players are Bob Hayes (22), Rayfield Wright (70) and Mel Renfro (20). (AP Photo)

New York Giants quarterback Norm Snead (16) rolls out to pass as guard Dick Enderle (62) looks to block during an NFL game against the Houston Oilers, Sept. 16, 1973. The Giants defeated the Oilers 34-14 at Yankee Stadium. (National Football League)

Dallas Cowboys quarterback Roger Staubach prepares to throw a pass as Duane Thomas (33) and Cliff Harris (43) block college All-Star Sherman White, during the first quarter of the game Friday, July 28, 1972 in Chicago. Cowboys won the game 20 to 7.(AP Photo/Larry Stoddard)

Franco Harris (32) of the Pittsburgh Steelers eludes tackle by Jimmy Warren of the Oakland Raiders on a 42-yard run to score the winning touchdown in the American Conference playoff game in Pittsburgh, Sunday, Dec. 23, 1972. Harris' "Immaculate Reception" came when a desperation pass to a teammate bounced off a Raiders defender. The touchdown gave Pittsburgh a 13-7 lead with five second left in the game. (AP Photo/Harry Cabluck)

Miami Dolphins Jim Kiick goes headfirst over Pittsburgh Steelers" Glen Edwards Dec. 31, 1972 as Kiick scores in third quarter of the AFC championship game at Pittsburgh's Three Rivers Stadium. (AP Photo)

Miami Dolphins' Jim Mandich takes in a Bob Griese pass near the goal line during the second quarter of Super Bowl VII against the Washington Redskins in Los Angeles on Jan. 14, 1973. (AP Photo)

Hall of Fame wide receiver Charley Taylor (42) of the Washington Redskins runs upfield in a 21 to 3 Redskins victory over the New York Giants on Oct. 14, 1973 at the Yale Bowl in New Haven, Conn. (Pro Football Hall of Fame via AP Images)

Coach John Madden of the Oakland Raiders lets the officials know what he thinks about their call of a tripping penalty in the second period of AFC championship game in Oakland, Sunday, Dec. 29, 1974. The call came on Ken Stabler?s pass to Cliff Branch on the Pittsburgh Steelers one-yard line and put the ball back on the 33-yard stripe. (AP Photo)

Miami Dolphins Larry Csonka racing through the Minnesota Vikings line. Miami defeated the Vikings 14-7 to win Super Bowl VIII, at the Los Angeles Coliseum, January 14, 1974. (AP Photo)

Oakland Raiders' Ken Stabler cocks his arm in preparation for a touchdown pass for a 26-yard score in Oakland, Calif., Nov. 4, 1973, against the New York Giants. Giants' rushers are Carter Campbell (79) and Dan Goich (68). Raider who blocks Carter is John Vella (75). (AP Photo)

Minnesota Vikings quarterback Fran Tarkenton, is shown rolling out for a pass with Ed Marinaro running protection for him, in 1975. (AP Photo)

Dallas Cowboys Preston Pearson, center on the ground, makes a diving catch for a touchdown during action in the second quarter of NFC Championship game, Sunday, Jan. 4, 1975, Los Angeles, Calif. Defending on the play is Rams Ken Geddes (36). The rest of the group is unidentified. (AP Photo)

Pittsburgh Steelers' tackle "Mean" Joe Greene encourages his teammates during the Super Bowl game against the Minnesota Vikings in Tulane Stadium in New Orleans, Jan. 13, 1975. The Steelers won, 16-6. (AP Photo/Harry Cabluck)

A smiling Joe Namath with suitcase in one hand and clothes bag over his shoulder, prepares to board the team bus in Stratford, Connecticut on Sunday, Sept. 14, 1975, to go back to training camp at Hofstra University. (AP Photo/RC)

New Orleans Saints Larry Burton, (80), goes high to take an Archie Manning pass as Atlanta Falcons defender Roland Lawrence, (22), kicks up a spray on the wet ground as he slips. Action was in the 2nd quarter of NFL game in Atlanta on Sunday, Oct. 5, 1975. The pass went for 25 yards. (AP Photo/J)

Minnesota Vikings defensive end Carl Eller (81) leads the victorious through happy fans after they beat the Los Angeles Rams for the NFC championship, 24-13, at Bloomington on Sunday, Dec. 26, 1976. (AP Photo)

Quarterback Terry Bradshaw of the Pittsburgh Steelers finds the going rough in the closing seconds of the game as Otis Sistrunk of the Raiders drops Bradshaw for an 8-yard loss on Dec. 26, 1976 in Oakland. The Raiders beat the Steelers, 24-7, and will meet the Minnesota Vikings in Pasadena in the Super Bowl. (AP Photo)

Washington Redskins' full back John Riggins (44) is slowed down near the Dallas goal line by Cowboys cornerback Benny Barnes, left, and linebacker Bob Breunig (53) during the first quarter of game at Irving Texas Stadium, Dec. 16, 1979. (AP Photo)

Receiver Fred Biletnikoff, left, and quarterback Ken Stabler of the Oakland Raiders proudly hold up one finger, indicating their team is No. 1, after defeating the Minnesota Vikings in the XI Super Bowl in Pasadena, Calif., on January 9, 1977. (AP Photo)

Jim Otis (35) of St. Louis appears to be fumbling the ball and Diron Talbert (72) of Washington hits him in the first quarter, Oct. 2, 1977, in Washington. The officials ruled no fumble. At right is Conrad Dobler (66) of St. Louis. (AP Photo)

Pittsburgh Steelers running back Franco Harris (32) wouldn't let things like a pile of his own players or Bills left end Ben Williams get in his way in Pittsburgh, Aug. 6, 1977. (AP Photo)

Dallas receiver Lance Alworth scores a Cowboy touchdown by taking a seven-yard pass from quarterback Roger Staubach during first half of the Super Bowl game in New Orleans, Jan. 16, 1972. Defending is Curtis Johnson. (AP Photo)

Dallas Cowboys' head coach Tom Landry is given a victory ride on the shoulders of his players after the Cowboys defeated the Denver Broncos 27-10 in Super Bowl XII at the New Orleans, Louisiana Super Dome, January 15, 1978. (AP Photo)

Green Bay Packers' rookie wide receiver James Lofton coasts into the end zone after catching his second of three touchdown passes, Sept. 10, 1978. (AP Photo)

Chicago Bears back Walter Payton (34) outguesses San Francisco free safety Vern Roberson (49) to grab a Bob Avellini pass on the one-yard line in fourth quarter action, Sunday, Sept. 11, 1978 at San Francisco. Chicago later scored on Roland Harper's plunge over the line to defeat 49ers 16 to 131. (AP Photo/Sal Veder)

Lynn Swann of the Pittsburgh Steelers right, battles Clarence Scott of the Cleveland Browns for the ball in the end zone during the fourth quarter in Pittsburgh on Sunday, Sept. 24, 1978. The ball fell incomplete. Pittsburgh beat the Browns 15-9 in overtime to run their record to 4-0, the Browns are 3-1. (AP Photo/ R.C. Greenawalt)

Oakland Raiders tight end Dave Casper hangs on to ball for dear life after taking pass from quarterback Ken Stabler that defeated Houston Oilers in the last minute of play 21-17, Oct. 8, 1978. Oilers linebacker Greg Bingham (54) arrived too late to block the pass. (AP Photo/Robert H. Houston)

Pittsburgh Steelers wide receiver John Stallworth (82) goes high to haul in a pass from Terry Bradshaw and score the first Steeler touchdown against the Dallas Cowboys in the first quarter of Super Bowl XIII in Miami, on Jan. 21, 1979. (AP Photo)

Pittsburgh Steelers quarterback Terry Bradshaw sits on the bench as the rest of his team watches the closing minutes of the XIII Super Bowl, in Miami, Fla, on January 21, 1979. The Steelers defeated the Dallas Cowboys 35-31. (AP Photp/Harry Cabluck)

Pittsburgh Steelers receiver John Stallworth takes a pass with a leaping one-handed grab and out of the waiting arms of New York Giants' defensive back Shafer Suggs, right, in the second period, Aug. 17, 1979, at Giants Stadium. (AP Photo/Ray Stubblebine)

Larry Csonka of the Miami Dolphins, rushes for short yardage during the first quarter of play on Sept. 30, 1979 at Shea Stadium against the New York Jets. (AP Photo/G. Paul Burnett)

San Francisco 49ers running back O.J. Simpson (32) picks up five yards and a first down against the Atlanta Falcons in San Francisco on Oct. 21, 1979. Falcon's middle linebacker Robert Pennywell (59) brings him down. (AP Photo)

Seattle Seahawks rookie defensive tackle Manu Tuiasosopo (74) pressures Houston Oilers quarterback Dan Pastorini (7) during an NFL game in Seattle, Wash., Oct. 21, 1979. The Seahawks defeated the Oilers 34-14. (National Football League)

Green Bay Packers running back John Brockington (42) in 1972. (AP Photo/Vernon Biever)