That's one of the first things I did. I sanded the firewall down to bare metal and also roughed the back of the VR where it makes contact to the body. I ran a fairly thick wire from the mounting bolt of the VR to the block. Is that what you mean?

Last night I replaced the wires going from the field outputs on the alternator to the VR. I also added a secondary engine ground (from the head to the firewall) just to be safe.

I'll check on the voltage going to the bulkhead from the VR. Thanks for the suggestions, I'm getting there!