I have 355k miles on our engine.. but I'm swapping it out now..
@ 235k miles I lost the heads (lost the water pump, then water, then overheated)
@ 28xk miles I had a spark plug break and get stuck between the valve and seat (I had the valve/seat fixed)
@ 355k miles I'm putting in my spare motor (building it) as the truck has been leaking oil into the water for the last year.. now its acting "not happy" so I'm swapping it..
BTW.. I gave up on the a4ld trans miles ago.. I now have about 60k or so miles on the 700r4
~Mark