I have a TKO600 in mine.
I started with a 3.55 rear and felt it was to tall and swapped to a 3.73. For my set-up, I've found the 3.73 to be pretty darn good. On flat ground (no/little load) I can use OD down to 45mph (or just below). Anything above that is golden.
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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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