AC Wiring harness vs. Non-AC Wiring harness

str12-340 said
My impression from your thread is that you are replacing the harness in front of the firewall. Check the application charts, but that harness is usually not different between AC and nonAC (at least that was true in 1970) The wiring for the AC under the hood is a separate little harness. The big differences and the substantial AC harness is under the dash, like someone mentioned earlier.
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Got it.

So the car I have was/is an AC car. Interior wiring is present and intact. But when previous owner pulled the motor, he unplugged all wiring under the hood and put on a shelf “somewhere” .

Yeah, I have that same shelf in my shop. Has a hole in it and it’s anyones guess where it leads. Good luck finding anything you put up there. Think I’ll just get another harness........