Get an electronic VR and wire both terminals to it as designed, and make SURE you got a good ground to the case of any voltage regulator you use: its the ground of the system. Cheap enough and a better system, more stable and I its a faster switching system (transistor instead of points) allows a better control of the 14.2 output voltage or whatever they are set at as well as the dependability of no mechanical points to service. Some EVR's have a little screw on them to turn up the output voltage. You already have a 'dual field' alternator, if you were close I'd give you a squareback for comparison testing.
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