You need the wiring harness from another monte. The grand prix one is really really hard to make fit.

 

you guys are so awesome i cant wait to get this project started i am thinking to start with the whole motor with supercharger and rebuild that way when its done i can just put the whole motor in all at once.....so i will need a wire harness from monte carlo sss??????

 

Yea, which is near impossible to find. Trust me. If you are careful you can mod your current harness to fit pretty easily. You will need a different style of injector connectors and a few extensions.