The Cleveland six is one of the very short list of Ford engines I like (the others being the Falcon six, the 289ci Windsor V8, and the "Windsor V4" - the Saab Sonnet used the front half of the 289ci V8 as a V4, and that thing was a rocket!)
The only real problem you'd have with the Cleveland six as a swap is that the engine is tall. Of course, this is what makes it such a torque beast - the tall block accommodates a longer stroke and longer rods, akin to the Chrysler Slant six. However, the Chrysler would be easier to install, due to the 30* tilt of the bore axis.
I wouldn't even try it in a unibody. It would be an interesting project in a frame-and-box, but I can almost bet you're going to need a body lift in anything Jeep...
"recon" (sic - reckon)(tm) "hihgly"(tm) "seceed"(tm)
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