I would just get the rad from the doner truck and fab up some mounts! As long as the old rad is a good one. I have heard that 350's can be hard to cool in a toyota cuz thee isent much room around the engine! I would do a electric fan on that thing! Just my 3 cents!
i dont have room up front to to fit the k5 radiator but could fit one in the back behind or in front of where the fuel cell will set also what fuel cell has the best bang 4 buck would the cab of the 4runner get extremely hot with the doors off
i cut a hood scoop in. and cut some of my wheel wells out. Heat around the headers gets trapped. i also have two 10inch electric fans. make sure your motor in timed correctly cause that can also cause over heating!!!
i got the nwor headers and motor mounts put a 3in body lift in to clear the 700r and am planning on runnin electric fans either way fenders are cut and i will put vents in the hood and heat wraps on the headers ho much heat will the radiator