You should be fine I ran a g54 behind my 7m in my 4runner and it held up fine. I used a stock supra radiator with twin electric fans. The supra radiator fits quite easily I'm not sure why more people don't use it. I wired the fans to switch power so they were always on when the engine was running. The fans seem to last forever and I would not trust my engine to some cheesy temp. relay. The motor would get a little hot on long slow hill climbs but I never over heated it.
