No Mike, the one and two hole pumps are quite different. I think that the only components they have in common are the moving parts. The bolt patterns are not the same and the angle of the inlet stub is also different. Put the two pumps side by side and it is immediately obvious.
The one hole pump is the same as on the GMC 270 CCKW engine but for the pulley.
Dave
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Hell no! I'm not that old!
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