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Re: 304 help
None of those engines fit easily in the unit body XJ. That is why it is not often done.
The 4.0 six is reliable and better suited for the XJ in weight distubution and torque for true off-road uses. That is a condition where you drive slow and in some low gear situations.
The Chevy small block works well in Hot Rods and vehicles such as my Corvette. CJs and such are a frame based vehicle and use a small V-8 more commonly.
We don't do swaps like that in California because it would never pass smog testing. That is because you would require special testing for a modified vehicle. Other regulations apply that would prohibit you from selling it very easily (especially your year vehicle).
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