Under hood wiring when going from slant 6 to Mopar Performance Shop
As far as the existing harness you may have to shorten a wire here or there (such as oil sender) but for the most part the connections are all the same. Follow the instructions for the MSD unit. Here's a diagram for a '70 Plymouth - essentially the same. http://www.70duster440.com/EngineCompart70.PDF
