My 62 Thunderbird with a stock 390 has been overheating on slow cruises (ie 5mph for an hour). I've decided to recore the radiator, hopefully with a higher performance build, replace the weak fan clutch, put in a high flow t-stat and, while I'm at it, swap out the water pump. I'm considering putting in a high flow water pump in, but I don't want it to cool it too much on a typical higher speed cruise. I've looked at the ones that flow higher at low speeds and normal at higher engine RPMs, but they don't make them for the earlier application with a generator, like my bird.
Anyone know if there are drawbacks to using a higher flow water pump on a street car? I'm guessing with a 180 degree t-stat that should restrict it from getting too cool, is that right?
