There's an ad on the Phoenix Craigslist for an engine & trans from a 98 Montero. That would be the 3.5 SOHC instead of the DOHC that you have but some mixing & matching of parts could yield a running motor for not too much $$$.

http://phoenix.craigslist.org/pts/672466398.html

95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes