anybody know of any sites with info on swapping a 4-litre head on to a 4.2-litre.
got an 89 yj, really wanna get rid of the carb.:mad3:
can get all necesary gear out of an 89 xj if need be.

Here's one:

http://www.monsterslayer.com/jeep/40Head/40Head.htm

www.dirtroad.com/ has a how to on the 4.0 to 4.2 head swap.