I can't comment on the 2" lift, but if you're not going to be using the extra power of the 4.0 then don't waste your money on the swap. The 2.5 is a good little engine, and you'd be much better served to keep it where it is and spend your money on some gears, instead.
If it's worth doing, then it's worth [I]over[/I]doing.
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The build, the gear, and the mileage: [URL="http://www.jeepforum.com/forum/f22/wasteland-survival-guide-engineering-greta-1344782/"][B]The Wasteland Survival Guide[/B][/URL]