That is the same engine as the Montero had in it in the later models, the 6G72. It can be done. With a Montero donor vehicle, that isn't too bad of a swap. Weld in motor mounts, throw the wiring harness in, fuel pump for efi, 90% of the work is done.

89 SWB, V-6 5SPD, OME Shocks, 16.5X37's, 2"BL, SR axle, Gen2 brakes, Lincoln w/Superwinch