Overcharging Problems?
OK, and I would think that your regulator "should" be fine for that alternator, BUT there is a possibility that the regulator is bad
Another way to check for voltage drop is to make up a great big jumper clip. Get some old fashioned alligator clips like you'd find on about a 20-30A charger
Jumper directly from the pos. battery to the IGN supply of the regulator and see if the voltage goes down
Jumper directly from the battery neg. to the frame of the regulator --make sure you get through the paint -- and see if the voltage goes down.