[Rickxjeep5]

Dont waste your time buying cams, air intakes, computer chips, inake tornado's, nos, turbo, or whatever else someone could buy from a mag. If you are going to put the wrench time (and for the same price as a NOS system and alot less then a turbo) in you might as well swap in a 4.0L HO. Get the complete engine and wiring harness for the engine, change the fly wheel to match your '87 tranny, drop in the engine, find the 4 wires to connect to '87 harness to make your gauges work... but would be a good time to upgrade to manual guages.

OR

Buy said engine, remove everything from the head up(EFI etc..) and put it on your 4.2. you could run the thing upside down. Cause by the time the turbo spooled up to get up the rock your carb is going to be starving for fuel.

You will need to upgrade your fuel pump (and tank).