The main difference in the engine wiring is length of some of the wires. Mainly the coil + and oil pressure sender. I know I don't have a genuine 383 harness but I may have one for either S.B. or /6. You have to lengthen the S.B. coil wire to use on a B.B. or tape back the oil pressure wire on a /6 so it comes out back by the firewall. No biggie on either one unless it needs to be 100% stock. I'll check tomorrow and see what I can find.
