The engine wiring should be A-OK. I put a new harness in there I bought from a guy on here from his 74 Dart. Fit like a dream! All the wires looked good too. The only roadblock there was figuring out where to splice all the wires in that go to the headlights and things up front. I traced wires and followed my diagram and figured it out though. His car didn’t have AC and mine does so eventually I’ll have to figure out how to wire that in, but I’ll worry about accessories after I get it running. After all the AC doesn’t even work if the engine isn’t running first so. But it will be nice in that old steel box in the summer time cause it gets up to 115+ EASY around here