Charging issues on a ‘64 Valiant...

Scanch said

My alternator has the brush internally grounded. One green wire with the spade and the black charging wire at stud.

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Then it will never work. IF your going to use the "flat" VR with the "triangle" connector, you MUST have an isolated field alternator.

First, show us a photo of the alternator. If you are lucky, it might be a modified one that you can "modify back." If not you have two choices

Either replace the alternator with a 70/ later (I would use a 73/ later "squareback"

Or replace the VR with a 69/ earlier and most any new one you buy will be electronic. That is easy to tell, just look on the bottom. The older mechanical ones have two wirewound resistors underneath, the electronic ones don't.