When I converted a new 6" diameter V8 crankshaft balancer to a 2-groove stovebolt item by pairing it up with a reversed big block V8 pulley, I also machined the single groove pulley off a 216 style water pump and installed a 2-groove pulley from a 302 Ford V8 water pump. It's a fairly simple conversion, but it does involve some machine work. The second pulley groove on the crankshaft and the water pump gives you more options of how to route belts for AC or power steering systems.
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!