Gotta go with William Smith - NOT WILL SMITH- he was a legit BA- Fluent in several languages, 2 time world arm wrestling champ, had a few pro fights, great physique, served his country... a TRUE tough guy. Loved him in Any Which Way You Can when he fights Clint
Charles Bronson - goes without saying, was 50 years old in Hard Times and had body of a 25 year old
Leo Gordon - character actor- Night of the grizzly, spent time in San Quentin
Robert Tessier - fought Bronson in Hard Times- big bald guy