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My Dart has A/C and that would be the only thing to keep in mind. Non A/C and A/C harnesses are slightly different.

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I've done a variety of harness in Mopars over the years, I'm thinking that a lot of the later under dash and engine harnesses, 1965 on, had the AC wires in them and they where not connected, maybe it depends on which facttory, brand and year OP, try and find a factory service manual for your car, maybe Google the net for the factory under the dash wiring diagram, it shows all the colors and connections Be very caeful on the black wires with no tracers, there are two of them in the 1971 Dusters and one is a ground and the other one is not If my memory is serving me correctly, I put my Duster back together in 2004 and 2005. There is a difference between the standard instrument clusters and the Rallye clusters and the wiring harnesses, nothing that can't be worked around though