Do you have a fan shroud?
Are you running a thermosat? If so, what temp?
What is the condition of your radiator?
I'd definitely replace the water pump, then make sure everything else is in good order. Fan shroud is very important for idle cooling.
Carr Chev in Beaverton should be able to get you a water pump...if you want original for a resto check with Super Chev Parts on East Stark in Portland, 256-0098.
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