I am thinking of using the 18-circuit Painless wiring harness for my Firebird, has anyone used this set up??? How easy was the installation? I am only thinking of using this because I found that someone hacked the wiring previously when:
a. putting in an aftermarket stereo
b. when they took out the factory air, they cut the wiring to the switches for the heater.
c. I can wire up pretty much everything to it because I don't have power windows/locks/mirrors

Also since I will be doing some serious wiring for the dash and electronics installation for converting it to KITT would it benefit me to use this setup?? Also thinking of using the TBI wiring harness from Painless for the new motor since the 6 is going. Again thank you all for your feedback and input!!