Bryan, did you get anywhere on your project? I ask because I am starting one very similar and was looking for pointers. I am trying to make a hill buggy out of an old dirt track car chassis and a 350 engine with a 1228747 ecm pulled from a 91 2500 truck. I got most of the wire harness for the engine to the ecm but not the part going from drivers side firewall to fusebox to column/gages. I need to figure out what exactly I need and what I can cut out.
I have looked at the schematics in the post Chewy pointed at but was wondering if a simpler diagram existed.
It would be wonderful to know what wires I DONT need so i could just remove them from the harness.