I have an HEI on the way... So that is something I already know. The issue is not the ignition, it is all the other circuits, ie: lights, signals, wipers, accy, air, etc. I am rewiring the entire chassis. The main concern I have is using the old connectors as many of them are damaged or loose at best. So back to the question, is a Painless harness worth the cost? or Should I make my own?