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For those guys with the 4.2, i did some reading a while back... If you take the head off the 4.0 and put it on the 4.2 it yeilds something like 30-40 hp gain w/o porting.
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Never mind the horsepower, the reliability factor is the best reason to do this swap. Basically, you're taking the entire top end (Head, intake and throttle body and computer) and swapping it onto the 4.2. Fuel injection rules, especially off road where off camber situations and steep climbs can shut you down when it's the least convenient.
I'm an addict. Just picked up a YJ frame, on which will go the drivetrain from an old Blazer, 60s front and rear, four linked front and rear...the list goes on...