Make sure the 307 pump is a closed impeller pump. Here is a kit.
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1964-72 Olds V8 bolt kit
www.fusickautomotiveproducts.com
You mean the water pump, I assume? The heavy duty cooling applications use a closed impeller water pump. Your 307 from the factory being A/C should have one. The pump I pulled off my 260 was. Anything including a Robert Bosch high flow thermostat to help the 403 is a good idea.WUUUUUUUUUUUUUUUUUUUUUUUUUUUT?
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