Scott became a full-time starter at left guard in 1976 and became a fixture at the offensive line through the 1984 season. Steady and rarely penalized, he emerged as one of the top guards in the league during the late 70s and early 80s and together with Pat Donovan formed one of the best left-side tandems in the NFL.
In 1980, Scott became the Cowboys' first All-Pro offensive lineman since Rayfield Wright in 1975. He was a two-time first-team All-Pro and a three-time Pro Bowler, attending the game from 1979 through 1981. Teammate Tony Dorsett once said, "When Herb goes after a guy, the next thing you see are feet in the air."[2]
Among his memorable moments, he and Tom Rafferty teamed on the block that cleared the way for Dorsett's 99-yard run against the Minnesota Vikings on Monday Night Football in 1983. Scott also caught Roger Staubach's final career pass, in a playoff loss to the Los Angeles Rams in 1979, but as an offensive lineman, he was ruled an ineligible receiver and the Cowboys were penalized, negating the play.
Injuries slowed Scott later in his career, when he saw some action as a tackle, retiring after the 1984 season.
Scott's entire professional career in the NFL was spent with the Cowboys (1975–1984). He was a mainstay and cornerstone of the Cowboys' offensive line during those 10 seasons. He helped the Cowboys win Super Bowl XII and three NFC Championships.