Aluminum cools better, but copper / brass in my opinion lasts longer than aluminum. I have owned two aluminum radiators in my life and both had welds brake within a couple of years. That was on a street car with daily driving, if you don't drive your car daily you may have longer life. I may just be unlucky though, others may have different opinions on this issue.
I will be running a 4 core copper / brass radiator in my 67 Camaro, 468 bbc with dual electric fans.
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