New to rebuilding. 74 dart custom 318

Welcome! +1 on going back to stock. However a complete new harness is a lot of work. Maybe you could get the "Painless" Harness but use it in "pieces" for example: Splice it into the Harness near the firewall so all the wires are about the perfect length and attach them one at a time to their prospective components. Good luck and sorry to hear about Goat. You were lucky to have a mentor and friend like that. I wish I did.