Any machinist with more than three brain cells to rub together could fit a small block V-8 oil pump to a 235 in a matter of hours. It would be very simple to adapt the mounting flange and drive shaft with a custom-made bracket. I doubt if it would even be necessary to modify the oil pan. It's just not necessary to go to that extreme if you've got a stock pump in good condition and a properly-clearanced engine.
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!