He also was a member of the Florida Blazers and San Antonio Wings in the World Football League (WFL).
He attended Cocoa Beach High School, where he was an All-county defensive tackle.
After his freshman season he transferred to Florida State University, where he began his career at center, before being switched to defensive tackle as a sophomore.
Amman was selected by the Dallas Cowboys in the tenth round (260th overall) of the 1972 NFL draft.
His son Eustis played football at Florida State University and was a part of the 2001 preseason roster for the San Diego Chargers and Jacksonville Jaguars.