225,000 miles is a lot for any car, especially one you didn't own since new.
Montero's aren't any kind of exception to that rule.
Will it fail catostrophically? Probably not.
Will it fail in some way? Of course.
If you cover your bases, baseline it, and are willing to put up with "old car" type issues, you should probably be ok.
These motors are good ones, but definitely have normal issues like coil packs failing, oil leaks, oil consumption, etc...
Heater/coolant hoses leak, O2 sensors go out, 4wheel drive and locker solonoids need repairing/replacing, etc, etc.
I could see spending several thousand dollars on maintenence and repairs before getting to actual modifications.
This will be the same with every vehicle of that age, though. Asian cars tend to hold up better, and in that way, you're ahead of the game due to the high level of quality built into the interior, body, frame and drivetrain of these rigs. Similar to land cruisers, Jeeps and old American iron from Dodge/Ford/Chevy.