The engine we just built up at Stovebolt headquarters was a high water pump block, with a casting date of 1959, and main bearing bores machined for the late model type bearings with anti rotate tabs for the upper bearings at the parting line. It gave us a few headaches because we had ordered mains for the early style block. I believe it also had an oil line under the pushrod cover. Don't assume anything about these oldtimers!
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!