i used a us radiator "desert cooler'' 4 core copper model w/trans cooler on truk
bought from brothers, drop shipped from us radiator
http://www.usradiator.com/chevrolet-...-radiator.html
at the time copper was cheaper than aluminum and i liked the black look
later i bought a shroud and electric fan from brothers it was also drop shipped from us radiator
i ended up covering the radiator so black or aluminum wouldn't have mattered
both radiator and fan/shroud have served me well in 30,000 miles and many 100*+ days