I have two 1954 1/2 ton 235 engines that came with Hydra-Matics - they had/have stock water pumps. As I posted above, they have the same water pump as was used on the 1954 standard transmission truck 235 engine.

I only have one of those engines in NC. I cannot see the casting number.

It looks to me that the two parts manuals that I have have slightly different/conflicting/confusing listings. I think the Hydra-Matic transmissions that came with an optional cooler used a different water pump (they must have been water/coolant cooled?).