I do not know if you are going to want to wheel your Jeep, but if you are, I would highly suggest going with the Howell fuel injection for your 4.2L engine. It is more expensive than a carburetor, but so much more efficient, and reliable. If you are going to do any wheeling, it is the difference between night, and day. Carburetors are horrible off road. One of the guys in our Jeep Club did that, and he loves it.