Wound up taking the truck to another fabrication shop in my area. They wound up doing a fantastic job on the downpipe, but I was kind of disappointed that they just cut the core support instead of cutting and welding the piping to clear it. The plan was to get everything running in this chassis and then swap it over into a clean shell that hasn't been in an accident in the past and one without underlying electrical issues. I've been working on the truck here and there the last few weekends. I found an issue with power going to the ECM in that with it unplugged from the fusebox and ECM, there was still 7V on the wire. I ended up cutting the wire and running an overlay harness in the interests of getting the truck running. After that, I found that the distributor was out of time with the crank so I removed the oil pump and re-timed the distributor with the engine at TDC on the compression stroke. Once that was done, I tried to fire it up. Nothing but cranking. Found that the fuel pressure regulator was not maintaining fuel pressure and it turned out the diaphragm inside the regulator was leaking so I ordered a rebuild kit for that. It now has spark, some fuel, and I still need to check compression, but it should be backfiring at a bare minimum or something... Time to sit and wait for more parts to arrive.