5.0 Harness For 67 Mustang, Who Is The Best

I have done several 5.0 HO swaps. A 54 truck with an AOD, a 40 Tudor Sedan with an AOD and my current car which is a 73 convertible with a Tremec and Cobra upper end. The truck was a stock harness and a PITA because I had to lengthen several components (i did use the 91 cluster and saved some time and money there). Don't mess with clip failures, old wires, hard to find fusible links, etc. The 40 had a Ron Francis kit on the body matched to a Ford Racing injector harness. Served me well, a bit pricey, but it looked great. I have a Painless full kit on the 73. More economical, the instructions leave a little more to be desired, and quite frankly, I would rather run wires to each location separately, rather than having them bundled. I ended up snipping a bunch of the zip ties. BUT, the connectors are all high quality as are the wires.

If you want to LEARN how an auto electrical system works, go Ron Francis
If you want to "plug and play" and don't have a lot of mods to wire up, go Painless
If you want to save money, don't care about appearance and can troubleshoot, use a stock harness.

And ground it everywhere you possibly can.