Entire 69 dart wiring harness

Ok… so here’s my dilemma. I’ll preface with Im an electrical idiot…

Got a new 69 dart in pieces… needs a wiring harness, but came with a brand new wiring harness.

Only problem is the wiring harness it came with is a universal wiring harness, the American Autowire Highway 15 wiring harness. There is also this other stock harness and I am supposed to be getting a couple other stock ones the guy found in his parts stash.

Has anyone used this wiring harness before? Should I try to figure this one out or should I get a new wiring harness specific for the 1969 dart? American autowire makes one for the dart and it’s $1200.

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