There is too much support for the 5.3-6.0 motors to ignore them. I would also go with a TH350 or 400 if you don't need OD.
Personally, I would think seriously about a 4.0 based stroker. I've seen your jeep go a lot of places like it is, but a bit more oomph wouldn't hurt.
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1988 Suzuki Samurai on propane
FJ 40 axles (4.10)
5.14 tcase
36" TSL SX
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