It's possible to adapt a 265/283/307 V8 balancer to a stovebolt six with a little machining. I had one I made that way at the homecoming last spring. The cost was about $125.00 with all brand new parts. It also has TWO belt grooves for adding air conditioning, power steering, etc.
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!