74 Dart 360 Sport

4.7Light said

I will hold onto my cars old factory harness as well.

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I would keep it as well , mine was toasted from previous owner being foolish an no skills with wiring and made it worse , but I found another wiring harness same year uncut for identical setup , I can repair my old if I need to as I have one now to go by to fix the burnt wires if I feel the need , but wiring is not complicated to repair unless burnt up an melted ,
Pull out your old harness and start tracing out , could most likely repair , use solder style connectors , these connectors work great for repairs and all you need is a heat gun and save the old harness .