GET A NEW REGULATOR early mopar had small amp alternators and when you put on a new alt. your regulater cannat take all the amps and pop goes the weasle make sure you dont ground nothing out or you pop it again get a floating 85 amp regulator and youll be fine the next thing you want to do is start upgrading your wiring its 45 years old cracked and broke where you cant even see its bad at just watch not to ground anything out you should be good to go evem a small bump would ground out and pop the regulator a new heavyer 1 will ,take a lil more juice you"ll notice your lights being briter and your interior lights better its better all around good luck
hope it helps if not lotta good peeps on here to get you fixed up rite