I applaud originality, if that is your cup of tea. However, here in the desert I found that copper/brass doesn't hold up as well as I thought.
All 3 or my squares had the original radiators and they all got to the point of having so many leaks that the repair shops would not repair them. My recent net cost sub $100 plastic/aluminum will reveal how well these last in the desert heat, especially cooling a big block. At least it has a lifetime warranty from Autozone.