I'm not sure about the hub diameter or other dimensions, but here's a link to a balancer for a Chevy 2.8 L V6 that uses a serpentine belt. It could probably be adapted to a 235 engine if you choose to use that type of system. One of the modified stovebolts I've got on the "to do" list is going to run that type of belt.

www.ebay.com/itm/167345205875?

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!