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Two possible gotcha’s come to mind.
1. Look at the water pump housing. See that hole drilled at an angle right below the rubber grommet? Is that hole clear? The purpose of that hole is to keep the cup around the drive shaft filled with water so the pump doesn’t suck air through the hole the shaft passes through.
2. Some of those motors had a restrictor up inside the water tube. It’s up in there a couple of inches. Those things get plugged up with debris.
Cure: Drill the hole out bigger.
2-1/2. I’ve done the spin it with a drill myself lots of times. But that isn’t a real good test. It doesn’t allow for the fact that while the engine is running, the pump is surrounded by air (actually exhaust). Any of that air/exhaust leaking into the pump will affect the way it works (or not).