If you got a "new- - -USA made Delco regulator" it's the only one in the world. Nothing with the Delco name on it has been made in the USA in the past 20-something years, at least. Back then, the name was "Delco-Remy". Try shopping on Ebay for the real thing- - - -they're still out there. Another option would be to find an old geezer like me who knows how to adjust the one you've got to work properly.
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!