I have a Monterey too, just a re badged Trooper, parts available from Vx and Isuzu, much of the running gear has a family link with my 2.8. Dependable motors, just check like all cars, some do rot, mine is fine. Petrols will be cheap, but pretty thirsty, the 3.1 td a pretty reliable lump, most seem to get 25 ish to the gallon, mine gets a little more.