T/A, Have you tried a 180 degree thermostat? What ratio water to anti freeze mixture do you have? In Florida you don't need much anti-freeze. Is your lower hose collapsing? Do you have a fan shroud and is the fan positioned correctly in it? Is the radiator clean, inside and out? A good 14-16lb pressure cap on the radiator?
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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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