1996 engine into 2001 TJ
 

Hey Guys,
I've had a pretty severe engine knock show up when cold and under load on my 2001 TJ 4.0L. I've got a line on a 1996 4.0L and just wondering if they'll swap. I'm going to rebuild the 1996 and swap over my head to retain the coil rail etc. Is there anything else I should know? Thanks a million.