I would suggest reading the "chalk another one up for the cast impeller" thread in this same forum. If you ignore all the instances particular to the Pontiac water pump, there are a lot of sugesstions for causes of overheating which apply to all engines. It reads like a novel, but there are good ideas there.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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