wiring harness

Start by going over to MyMopar and downloading the appropriate factory service manuals as well as the aftermarket (2 page) wiring diagrams so that you can compare them. If the bulkhead connector plugs together you likely can re-pin the engine side to get things to match.

Be specific about what you are referring to. You use the word harness, ??whut??

What specific harness? Is this a repop new that was supposed to fit a 68, or what

Is your "other harness' a junkyard one you found?

Be aware that the FACTORY MANUALS ARE WRONG for a few years concerning theyellow start wire and the horn wiring. This is easy to figure out.