A first generation 4runner with a V6 is a good base for a swap to a later 3.4 V6. And of course then if you still feel it's underpowered you can add one of those emissions approved TRD superchargers for heaping helping of horsepower. -- Matt

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)