Okay, my '55 is a Bel Air with a 265 c.i. V8 and a generator. According to my shop manual, all '55s passenger vehicles have 12-volt sytems, and I used to have a '55 1/2 ton truck with a V8 which was 12-volt as well. Can't vouch for the 6 cylinder versions. The '67 Camaro does have an alternator, and I'm thinking that might mean that the voltage regulator would be different, but I don't know enough about electrical systems to know just how different it would be. I don't want to convert the '55 to an alternator just now cuz it has factory power steering with the generator-mounted pump and I don't want to change to late-model power steering. Maybe I should just let well enough alone. Don't want to screw up the electrical system just to have a purty voltage regulator.