Join Date: Jun 2001
Location: Wichita, KS
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Re: need advice
Keep the 350. It is by far the most common engine around, very reliable, and powerful. The 4.3 is basically a SBC with two cylinders cut off. It will swap all front parts(water pump, timing cover, etc) It will also bolt right up to your T-400. The problem is the 400 is a heavy duty trans and takes a lot of power to turn, and will sap the strength of a 4.3. Stick with the good ol' 350, and replace the motor mounts.
Depending on your intended use of your CJ, and the general condition, patching the tub will be cheaper in the long run. If it is in rough shape, replacing the tub is easier and cheaper. If it is fairly stright and rust-free, patch away.