Like Bob, I have used the adapter plate approach. The ebay plate does require the use of a 1942 or later water pump (originally had 2 holes through the pump backing plate into the block) rather than the earlier pump (that had 1 hole through the plate into the block). Their instructions clearly state this and are also clear that the pulley sizes must match to keep the speed ratios correct. I wanted to use the older 1 hole style pump so made my own adapter plate. You do need to use more care with the orientation of bolt heads to avoid conflict with the 1 hole design but it can be done
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