So the NOS harness I got is exactly the same as the one that was in the truck and fits perfect. The distributor wires are the right length, no splicing required anywhere. It's really nice to have new wiring!

I also switched out the original bulkhead connector and cleaned up the other harness connectors, there was a lot of corrosion and old, dried up dielectric grease.

Now I need to figure out what I am doing with the ammeter and then re-wrap the harness under the dash that the P.O. unwrapped for some reason. Fun times.

Thanks again for the replies.