I have an '87 chevy 4x4. I am taking the 350 and TBI out and putting in a very built 400sb with a carb. My question is will I have to change any wiring harnesses to an older style. As far as I know the computer only controls the injectors and o2 sensors. If I just unhook the computer it shouldn't effect anything in the dash or prevent the truck from starting with the new motor correct? I already know that I will have to change the gas tank floats and maybe fuel lines and flexplate. Any help on the wiring issue would help me out a lot. I would really appreciate it. Thanks.