I put a LOT of highway miles on a 58 Chevy Delray coupe with a 3.70 rear end and a 235. 14" wheels and "3 on the tree". It was very comfortable at 65-70 MPH, and 80 wasn't much of a problem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!