Funky alternator wiring- '73 Duster

You would probably do better to make your own custom charging harness. One reason is that the factory design running the large ALT current thru the bulkhead terminals to the dash ammeter causes big problems (melted plastic). They had the bulkhead right in 1963 and 1965. Search "MAD Bypass". In my 1965 Dart (avatar), I used the charging harness from a Magnum V-8, but route the ALT wire thru an underhood fuse/relay box (from 1990's Jeep). Consider the "big picture" before jumping in.