I think everybody scared the op away after the pissing match or throwing in their $.02 Copper/brass cool better than aluminum but it is used more often. Shouldn't be a factor unless you want 100% stock look. As mentioned a lot of factors go into getting the "correct" cooling. As a rule of thumb compare the original radiator that was used (engine/accessories(AC) etc) and compare it to a replacement. You can use this as guide or use this one.