I have a 66 Belvedere with the original wiring harness. I have had problems with the head lights, dome lights, tail lights, wipers, instrument panel. Just problem sometime shake a wire and fix it something more. Well my question is which is better year one original harness or painless performance harness.? The car is not original its a restomod I have a 6.1 hemi installed, 727 torqueflight trans, custom stereo system, 140 amp alternate. All help welcome.