It is just for the 4.2, it's for the carb. What year is your Jeep?
The newer 2.5 with multi port injection, you can swap in the 4.0 throttle body, bigger injectors, add a electric fan and get rid of the clutch fan, a good header/ exhaust system, full tune up. The other thing is to re gear your axles.
The older 2.5 with throttle body injection, what I have, there's not much but the e fan, exhaust system, and tune up.
How this helps!