Unless there's some overriding reason to stay "original", swapping to a 10-SI internal regulated alternator would be a much better choice. The "Delcotron" alternator with the external regulator that you're running now was a fairly low-capacity unit with chronic diode failure problems and a few other gremlins. The switch to the later design is easy, and it's much more reliable.
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!