i built a 4.6L stroker and didnt change any wiring. my YJ is a 1990 and my motor is a 93. I dont know how much different any woring would have been, but i know with all the mods i did to the motor, i eliminated ALOT of BS wiring and emmissions i didnt need anymore. the motor runs great minus the fact i made the mistake of putting a weber on the motor instead of a MC2150. But that is in the process of being changed.