I'm considerably more experienced with the XJ as my father owned two (and a CJ, ZJ), now my buddy owns one of my father's old XJ's (200k, lifted 3", 32s) , and another buddy has got one (240k, 5", 32s), and my in-laws have got one too (stock, 150k).
In general, I'd consider the 4.0L I6 one of...