Drop me a PM, and I'll respond with a phone number. The procedure requires fabricating a different driven gear pivot shaft from oil hardening drill rod, then hardening it, and making a spacer plate between the pump body and the cover plate to accommodate the taller gears. it's much simpler to make an adapter to run an unmodified 250 I-6 oil pump. Unless you're creating a demand for more oil volume than a stock 216 needs, doing either one is a waste of time and money.
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!