Thanks all of you for the input. I wondered if the impeller was backwards based on the '37-38 shop manual, where it looks like the impeller fins are outboard of the rest of the pump:
<img src="https://p7xepq.bn.files.1drv.com/y4mEPnUS3HUgstOxaBvjWaKJr_CiIeh0SbdeLiy6IQAXlWJQcxMWJ14guVagcCeO8aN8Cbd7sYzHTP3pchZGBt_X1Mcc9akVyGrVvqkTeA7y9xuIyc2IbrfrZt0W0mQEzm04a6L2DWgiUNfcy1d4W1RATmRUaURmdZBtJbCFo20pffclBJWW4ET2lOM7GUayN3HVrgh27nYF0QrmEyVXCmb4A?width=354&height=578&cropmode=none" width="354" height="578" />
Regardless, I agree with Owen_Dyneto and flackmaster regarding the inefficiency of the impeller. As it sits right now it leaves a huge gap in the water inlet, which means that likely very little water is actually getting moved.
Jim, you're correct that the engine has a history of overheating. That's what originally destroyed the block. It seems like this water pump/impeller may have contributed, as well as a poorly made water jacket and aftermarket thermostat.
-Kevin
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