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Really need some help on this one......I bought a 86 jeep cj7 with the 2.5 4 banger engine, T-4 trans and 373 rear. Jeep has 33" tires which takes away a lot of the power. The 4 cyl runs good, just not enough power. I found a 4.2 out of a 80 model cj7. Has anyone made this swap before? I am told...