In the "useless trivia" category- - - - -replacement "high pump" blocks were still being made for several years after they stopped being installed in production vehicles. The 261 engine we installed in Charlie a few years ago has a high water pump mounting, but it has a 1959 casting date, and it was machined for the later model main bearings with the locator tab at the parting line between the block and cap. I had to modify the block to accept the early main bearings, or delay the project a week or more while a different set of bearings was ordered. I chose to make the older style bearings fit.
Jerry
