been there, done that....i think about 3 times already.
my and my cousin have 90 4runners with auto tranny and 4wd, we swapped in 99 3.4 v6's and slapped on trd superchargers.
rebuilt tranny, modded valve body to handle the 3.4 s/c'd power.
also swapped 3.4 motor into a 93 truck, manual 4wd.
did our own wiring and speed sensor works, tach works, etc....