I checked a couple of water pumps this morn. The bolt circles are 1 3/4, and 2 1/8. The water pumps I checked were both re-manufactured, one was a 292 early style with large by-pass, the other sbc, and both had the two bolt patterns. That maybe the answer look for a rebuilt with both patterns on it.

Larry

I don't own a vehicle that isn't old enough to drink.