$150 aluminum radiator

I have one in my 68 Dart and yes the holes had to be redrilled but didnt have a problem with the fan hitting probably because I have the stock fan and clutch. I only probllem I have with cooling is it being over 100 degrees up in the desert where I live cant seem to keep car cool. So Itried a bigger radiator went from the 22" aluminum to a 36" copper/brass radiator and went for the test drive tonight and guess what it still got up in temp. So now I will check my water pump to see how many blades is has and my change to a high flow style.