I intend to replace all of my old, and very worn wiring. I am adding a Vintage Air system to a non-AC car, updraded stereo system, power windows, HEI, single wire alternator, and high intensity headlights. Do you think I should buy factory replacement harnesses, or go with a painless style replacement, or some other option that I'm not aware of. The old harness could be canibalized for connectors and terminals, but I'm not really sure how many are in good shape. I want the final result to be a clean installation with as little fuss as possible. Any suggestions would be very helpful.