Mine has 3.55's and a Turbo 400 (400CI). 70mph is about 3200 rpm and the car will happily do that and more for as long as you can pump gas into it. Thats the way it was back "in the day". Its them damn loud ass mufflers most folks run that turd up a good highway run. My 20" Super Turbos keep it sane and quiet enough to listen to the radio (I never turn it on) or hold a normal conversation. I would go no further than a 3.23. Acceleration is to much fun.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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