Why not install a 2 groove crankshaft pulley? With very minor modification to the length of the snout, a 2-sheave balancer for a 250 inline six will fit a 235. A 2 belt water pump pulley for a Ford 302 can be adapted to a 235 pump by slotting the bolt holes a little. I've done both those modifications on 216's and 235's.
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!