My car is overheating on hot days. Like 90* days. Every day lately. If I don't do something it's going to ruin my new crate engine. I already changed to a 180 high flow thermostat and got a new water pump, which helped, but for some reason my temps start to creep up as long as I'm climbing a hill, or If I decide to gun it. It's gotten as high as 230 coming up the hill to my house. 2nd gear doesn't help either. I seem to have some type of load related issue. I've played with the timing, but to no avail. Currently it's at 14*btdc. I've flushed the radiator, everything came out clear. I have a 6 blade summit 17" flex fan that fits very well in the stock shroud; it was always sufficient for the 307 but my Gmpp 350 still manages to overheat. Do I, or should I, need an aluminum radiator? Or is there anything I can do to reduce the temps? Does that water wetter stuff actually work? My car has 2.56 rear gears and tall tires, so I suppose that is probably contributing to my problem.