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Swap question: 99 4.0 into YJ with carb

no, they will not bolt up.
the YJ is a 258 if it's the I6, they had completely different heads/ports.
Your best bet is probably to go aftermarket if you want to keep the carb
I think Clifford has the intake/exhaust manifold to do that swap.
Here's the clifford 4.0 HO carbed intake:
http://www.cliffordperformance.net/...de=CP&Product_Code=47-4520&Category_Code=J258

or you could get the YJ 4.0 stuff and just go with the intake/injectors and such that are on the 4.0.
http://www.burnsvilleoffroad.com/Articles/01_03.aspx
 
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