You need a Chevy standard shift passenger car starter from about 1950-54, assuming you're still running a 6V electric system. Positive or negative ground doesn't matter- - - -the starter will work OK either way.
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!