I'm pretty sure 63 was the first year for alternators, the ones with a 4-connector external regulator. Those things are a royal pain in the butt to work with. Unless you're building something that's supposed to look factory original, a 10-SI internal regulated alternator from the middle 1970's or newer would be a much better choice, reliability-wise.
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!