[68post]

I'm glad your keeping it genuine. Just drop in a 327 and let it spin (only 4.88/5.13's would require a 283..lol) !
I drove a '70 chevelle with 4.56 gears and a TH350 / 350 combo and only about 27" tire height, but not at 70+ mph sustained. It really just wanted more cam at highway speeds.

I get a chuckle when folks worry so much about turning 3,000 rpm, just hurts at the pump alot.