1974 Factory ignition wiring harness

Trying to put son's 1974 318 Scamp back to OE and could use wiring for the Electronic Ignition. PO added some external aftermarket stuff that really is a mess. If you are scrapping '73 and up I think the harnesses are the same.I have many missing wires and a couple color changes so I think fresh is the way to go......Thanks for your time.