I don't know that much about FZJ80's (other than headgasket problems), but with FJ80's about the only things likely to take a dump are things that you should assume are going to need to be fixed, serviced, or replaced anyway. Examples of what I'm talking about are: AC compressor, starter, radiator, alternator, birfs, bearings, brakes, u-joints, etc.
I haven't heard of a lot of Land Cruiser engines having catastrophic problems. Not sure about transmissions, but even if that needs a rebuild, it's not the end of the world.
'92 FJ80, 3F-E Grrrrrrrrrrrrr, 464 Beige, flareless, 255/85R16 Toyo M-55's on 70 Series steelies, OME 861/862... dubbed "Old Suzy" by my 3-year old.