steekers,
Are you looking for power? A Brit named Robert Bryce discovered that a 4.2L crankshaft will fit in a 4.0L block with very little modification (just
1/8" trim off the snout). Stroker kits are available to build your own; search eBay "Jeep stroker". Or you can by a built long block for $3,500 -
$5,000.
I swapped out my Wrangler YJ's 4.0L for a HESCO built "stroker" engine, bored and stroked to a 4.7L. Installed bigger fuel injectors, a bored out
throttle body, headers, adjustable MAP sensor, better air intake. Never had it on a dyno, but similar builds got 260+ HP. With a pair of paddle tires
on the rear, it kept up with the sand rails on Glamis and Gordon's dune runs. I should note that it took a few other mods to do that: Ford 8.8" rear
axle swap, slip yoke eliminator kit, shackle reverse kit, full roll cage, locking diffs, Fox shocks, custom clutch.
My first car was an AMC '66 Rambler, 232 CID straight 6. AMC stroked that to a 258 (4.2L), which I had in a number of AMC Hornets, a Gremlin X, and
Jeep CJ's. The 4.0L is a more modern version of that old engine. Too bad it couldn't remain in production, due to increasingly restrictive smog rules.
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