There's a guy on e-bay who often has adapter plates to fit the original Off-the-shelf 216 water pump to a 235/261 block, thus getting around the need to buy a special modified pump. His instructions say you will need to drill and tap two new threads into the 235/261 block. He doesn't appear to have any listed at the moment, but keep an eye out. Who knows, you might have the know how to do this yourselves?
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