All Confused HELP!!!

BLACK OK, My car is a 1972 factory a/c 340 demon. Here are some photos. First question. This is the stock harness from M&H. Because I am going to run a direct 8 or 10 ga wire from the alternator to the positive battery post on the starter relay (or should I go directly to the positive battery post?) should I just cut and dead end the BLACK positive wire on this original harness. I believe the other two wires go to the alternator fields for the voltage regulator, correct?

View attachment 1714943353

This is going to depend. If you eliminate the ammeter, the black would normally become a parallel with the fuse link to feed juice into the interior through the bulkhead connector. If you are leaving the bulkhead connector "as is" I would keep the black. If you are feeding a larger gauge wire direct through the bulkheead connector, you could eliminate that. This wire normally goes through the bulkhead to one side of the ammeter

EDIT I'm starting to see what you did. You have a nice big new "red" through the bulkhead AKA "mad" right? That fuse link should splice to that red