[6] In 1951, Marchibroda and St. Bonaventure went 5-4, but he continued to rank high in the collegiate passing statistics with 72 completions on 170 attempts for 1,146 yards.

[7] A notable matchup that season came when Marchibroda led St. Bonaventure to a 22-21 victory over the University of Louisville, whose freshman quarterback Johnny Unitas was making his collegiate debut.

Marchibroda served as the starting quarterback for the North team in the 1952 Blue–Gray Football Classic, where his squad lost to the South 28-7.

In his only NFL starting season, Marchibroda compiled a 4-7 record with 124 completions on 275 attempts for 1,585 passing yards and 12 touchdowns.

[16] Inheriting a 2–12 ballclub that was one of the two worst in the NFL in 1974, he led one of the two biggest turnarounds in pro football history when the Colts ended the 1975 regular season at 10–4 and qualified for the playoffs by winning the AFC East title for the first of three consecutive years.

His time with the Baltimore Colts nearly lasted only a season when he resigned on September 5, 1976, in response to team owner Robert Irsay verbally abusing his players after a loss in the final preseason match to the Detroit Lions at the Pontiac Silverdome three nights earlier on September 2.

He was rehired two days later on September 7 after offensive and defensive coordinators Whitey Dovell and Maxie Baughan threatened to quit and the players considered boycotting practice, all in support of Marchibroda.

The team was crippled by Irsay's acrimonious contract disputes with Lydell Mitchell and John Dutton which resulted in the players being traded to the San Diego Chargers and Dallas Cowboys respectively, Bert Jones' shoulder injuries that limited him to only seven games within those last two seasons and three years of questionable drafts.

[21] After a one-year hiatus, he served as quarterbacks coach for the Chicago Bears in 1981 and offensive coordinator for the Detroit Lions in 1982 and 1983 and the Philadelphia Eagles in 1984 and 1985.

Similar to his first time with the franchise, the Colts had ended the previous campaign at 1–15, fired Ron Meyer after five winless games and replaced him with Rick Venturi on an interim basis.

A Cinderella run to the playoffs ended a big play short of Super Bowl XXX when it lost the 1995 AFC Championship Game to the Steelers.

Despite this, Marchibroda parted ways with the Colts on February 9, 1996, after his demand for a contract extension of two years rather than one was rejected.

[30] After leaving coaching, Marchibroda served alongside Bob Lamey as a radio color commentator for the Indianapolis Colts from 1999 to 2006 .