If you've got a 1954 or early 55 235 block, peoiple use them to replace 216's in earlier production trucks like the ones from the 1940's and early 50's. The water pump is in the correct position to make the fan line up with the radiator correctly. Late 55 to 62 engines need a relocating adapter to run the high mount water pump. I've seen outrageous prices on Ebay for good condition stovebolt rocker arm and shaft assemblies. Ditto for cylinder heads with the "848" casting number- - - - -1956 or 57 to 62 or so.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!