One wire alternator nonsense

str12-340 said
and after you make a dozen repairs, you still have a 48 year old harness... for $270 you can get a complete factory correct harness from Year One (M&H) and put it back right. By the way, please don't drill through the connector, drill through the firewall and put in grommets to protect the wires. That's what Chrysler did for fleet vehicles with 60 amp alternators.

I agree. Unless your going to EFI with the car, this is probably the best path.
Put a stock harness in and do a fleet wiring. You'll have to do a little repair and customizing due to damaged R6 wire on the dash side.
Or
Wire it like they wired the rear defroster grid cars. That factory option didn't use the R6 wire from the bulkhead connector.