Machine the original pulley sheave off the 216 pump, leaving the hub where the fan bolts on. Use a stamped steel pulley for a Ford small block V8- - - -302 or 351. They come with either one or two belt grooves. That solves the pump speed problem.
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!