70 Duster Eagle Hemi Swap, No Spark!

You may not be that far off, I would take the harness and try to plug it onto your engine. You may have to extend some wires for the 6.1 intake or change some connectors because of year changes, but nothing too bad. I started with an 07 mds jeep harness and converted it to the non mds 04 truck harness (because it was cheap) with two or three connector changes.