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What you need to install a HO 4.0L cylinder head on your older Jeep inline-six engine.
Parking Lot Engine Problems at 2016 Moab Easter Jeep Safari
4.0 head and EFI on a 4.2 block - Jeep Strokers
4.0L Head Swap on a Jeep 258 4.2L Engine
1983 Jeep Cj7 4.0 Conversion COMPLETE! -Swap Vid 4-
Jeep 4.0 guys,check this out.
Remanufactured Long Block AMC 258 4.2L Straight 6 1972-1988
Is this a rebuild or replacement engine?
Jeep YJ 4.2 to 4.0 engine swap wiring part 1
Planning 4.0 Head & FI swap
Jeep 4L Head Swap on a 4.2L (258)
Jeep Engine: AMC 258 I6