Ok,
So an early 90's 4 runner will accept the tundra engine and 4wd trans?
It can be made to run on the stock ecu, and as you said, 'as stock as possible' ? I would definitely like to do the same then. I'm not too too worried about the structure thing, as I think the 4 runners (just like other toyota frames) are stout and overbuilt.
I'll have to search around, as my biggest concern is wiring, I don't feel like hassling with that. Other then wiring, does it drop right in?