He also played college football for Utah State where he set multiple passing records as a senior in 1963.
In 1968, Munson was traded to the Detroit Lions where he remained for eight seasons (1968–1975), competing all the while for the starting quarterback position with Greg Landry.
Munson concluded his career as a backup quarterback for the Seattle Seahawks (1976), San Diego Chargers (1977), and Buffalo Bills (1978–1979).
[1] On December 14, 1964, he connected with Bucky Pope for a 95-yard touchdown against the Green Bay Packers,[5] ranking as the longest pass play in the NFL during the 1964 season.
[1][6] Munson eventually lost the starting quarterback job to Roman Gabriel and saw only limited action as a backup for the Rams in 1966 and 1967.
[8] In his first season in Detroit, Munson started 10 games for the Lions, leading them to a 4–6–2 record and completing 181 of 329 passes for a career-high 2,311 yards, 15 touchdowns and eight interceptions.
[1] In early September 1976, the Lions traded Munson to the Seattle Seahawks in exchange for a future draft choice.
[1] After retiring from football, Munson lived in the Detroit area for several years, working for an automobile tooling business.