Connectors and wire for splicing

I can think of a couple of options here that may help if you wanna go new. You could replace the whole engine harness. Or call Evans wiring and see if they would just make you the runs you need, they also sell complete harnesses. I bought my engine harness from them for the big block with electronic ignition going in my Demon for 115$. If they will sell just the separate runs you need just de-pin the connector at the firewall and install the new.