It may sound stupid and I am not trying to insult anyone's intelligence, but with going to the serpentine belt are you sure you have the belt routed correctly? I have seen it before that the routing was wrong the water pump was turning wrong direction. Not on a conversion kit, but on a car that came factory equipped with a serpentine belt, and the belt got replaced and then started overheating.
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1973 Formula 400 4 spd 04C build date Norwood assembly plant.
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