If you've got an automatic and 3.23 gears I wouldn't venture to far beyond an 068 or something close. I personally like a hyd roller.... and have a 220/224 @ .050 Comp Cams with my 69 400 with a Turbo 400/3.55 rear.
Is your car an A/C car?
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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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