When I was looking over the truck I noticed the cut wiring harness immediately. The truck was originally a TBI truck, however that motor seemed to be long gone. Prior to this PO, that owner had put a build 427 motor in the truck and wanted to keep it when he sold it.
So the PO swapped in a crate 454 motor. Unfortunately they did not take the time to correctly remove the pins they weren't using, but it wasn't a big deal.
Here was what the original harness looked like:
I began to go through and label each wire and what it powered: