Jeep Strokers

so i drive a 32 xj thats getting tired. i saw the episode of trucks the cheep Cherokee. they did a 4.0l stroker. if i went that rout would my mpg go down. or i thought i would just go with the 4.2l head and new cam injectors and valve spring. to help get batter mpg. what year 4.2l parts fir on 32 4.0l. give my some feed back

A '32 xj... I gotta see pics of that..

typeo i ment 92

Feedback: read until you have a good handle on what you're going to do/have done. You won't be using a 4.2 head for anything.