I'am going to swap my 87 V6 camaro to a 350 with a computer controled Q jet. I'm getting all the parts off a donor car, except the 350, how do i change the ecm? i'll have the engine electrical harness for the fuel and emissions system, do i need to change the entire electrical system of the car? also, gm has a chip for a 350 conversion using a CC Qjet, would that be something i would need?