Help needed with sb 318

So electrical system was not charging, but battery checked out OK and took a charge. Alternator has checked out OK and putting out 14.7 volts on the bench, so also OK. Either have a bad voltmeter or have a fault in wiring somewhere, which can be found.

But what we have here is a not to spec Delco alternator on homemade bracket. As I understand it, these GM alternators have internal regulator. There does not appear to be a stand alone voltage regulator on the beast. Talked to my resident Dodge guy and he tells me swapping to a Delco for the internal voltage regulator is the way to go. Is that true? If so, what model alternator (with internal regulator) would guys recommend that fits the stock 318 alternator mounting brackets? Auto parts store no help. Once you leave land of "to spec", they are done.