General rule in the Air Conditioning World:
(and a law of physics besides)
HEAT TRAVELS TO LESSER HEAT !
So when the engine bay is already maxxed out on additional heat from the engine and headers, there is no place for the heat in the radiator to travel to lesser heat.
So unfortunately the heat stays in the cooling system and the engine over heats.
Put a set of stock cast iron exhaust manifolds on the engine, that will send the exhaust heat out to the back of the car.
Header tubes in the engine bay radiate lots of heat up into the engine bay, heat rises up. Lots of surface area there on the header tubes to transfer heat from.
Get a set of the HP Factory exhaust manifolds, (factory 340 exhaust manifolds work well on the small blocks) and 2 1/2" exhaust system all the way out the back, heat goes out the back too.
You can thank me later.
Good Luck on the car.
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