Engine Compartment Harness question

Hello all. Yes its the newbie with lack of knowledge again..........I have a 67 Dart. I was a bit bored and it was cold out so i brought a few items in the house to tinker with. I decided to tackle the wiring harness for the engine compartment...........Approx. 1 hour later of untangling the flippin thing i realized that this harness is for a newer Dart:scratch:.......So my question is.........67 Dart with a im guessing a 73 harness.........Will it work? I see the connection to the fire wall is different. It wont plug in. If it dosent work then i will have to get rid of it and get one that will............Any help in this matter is big time appreciated...........Thanks Nite Moves.............AKA Edd:thumbup: