A 216 water pump with the pressed-on cast iron pulley can be machined to remove the belt sheave and converted to accept a bolt-on stamped steel pulley. You're not limited to that scarce and expensive narrow belt 216/early 235 high mount pump. A sheet metal pulley for a small block Ford V8 (289, 302, etc.) is the right size and close to the right offset. I've made that conversion on a few occasions.
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!