I am putting a 3F-E in my 68' FJ40. My stock radiator seemed to be in good condition so I had it rotted out and tested at a local shop. But I am concerned that it may not have the cooling capacity. does anyone know if the stock 68' radiator will cool a 3F-E? I have heard that the 4 row aluminum radiators are better but I don't know if I need one or not.