Factory radiator and shroud. 7 blade factory fan with an HD clutch. 180 degree Stant SuperStat. The 455 stays within a few degrees +- of the thermostat's rating.
I also drill a couple of small holes in the stat for filling ease.
I ran a colder (160?) thermostat a while back (years) and the engine bay always seemed oddly cool when I opened the hood.
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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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