how much rad do you need to cool a 426sb

ya i know its espensive but the stuff is the best on the markit . so to me its worth the money to be to keep the over heating gods at bay. nothing i hate worse then when you are in the town and you engin that you just spent ten grand on is over heating becuse we went cheap on one of the most inportant part to keep the engin alive the cooling system . so to me its worth every cent but on they other hand iv never run afco rad what temp are you seeing.????