Thank you another challenge solved
You really should spend some time in the 73 manual. On past the electrical diagrams, are pictorial diagrams and general locations of connectors. On the electrical diagram are ovals with numbers like "CE-5" or "CI-8". These mean "connector, engine bay, no.5" or "Connector, Instrument harness, no8" Then if you thumb down past the diagrams to the connector illustrations, you'll see a section there with all the "CE" connectors, all the "CI" connectors and so on.
I DON'T LIKE the 73/ later diagrams but you can "double up" and use both them, and the ones in the wiring section of MyMopar. Those are aftermarket, two page, and are simplified, and don't cover all circuits and connectors, but they can be easier to follow, and can be used alongside the ones in the service manual.
You might be interested to know that some of us learned this the hard way, no instructor, no videos, and no internet. When that 73 was new, I was spending my last couple of years in the Navy, at NAS Miramar, and owned a 70 440-6 RR which I had swapped a 340 into.
Picture with the guy and trophy was the original owner, who I still talk to. This was sometime I think in 70, and we had been to Lions where he got a trophy in pure stock. Other photo was either in 73 or 4 when I owned it. He and I are still friends and still talk by phone
