Here's a screen shot of a GMC oil pump I just bought on Ebay- - - -from a seller who didn't know what he had, or what it's really worth. There's a considerable size and volume difference to a Chevy pump, but the mounting method is similar. That's why a GMC oil pressure dash gauge has a 60 PSI full scale reading.

www.ebay.com/itm/136443940508

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!