Cars that Emanated Masculinity: the 1960 Chrysler 300F.What was the first muscle car?

This statement stuck with me after reading an article from a 1960 Popular Science (April, 1960, p.72).
Ken Fermoyle, "Driving Chrysler's Stick Shift 300F."

"This is a man's car -- big, muscular, and fast. It's handsome; not tricked up, not cute. Its ride isn't boudoir soft. Even its interior, split by an 11-inch-high console, discourages togetherness."

 What car was the first muscle car of the post-war era?