The 4 bolt water pump and associated timing cover are not notorious for improper spacing between the impeller of the pump and the cover like later pumps that used a divider plate. However, I'd use some modeling clay to measure the clearance between the impeller and the big opening in the back of the cavity that it spins in. I don't know what the measurement should be, but on later style pumps 0.030" or so is desirable. Don't forget to use a gasket when you make the measurement.
Just curious, where did the temp sensor plug into the engine at?
Someone will probably chime in soon with the "reverse rotation direction" pump old wife's tale.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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