Aluminum radiators are available in black, or if you just want to add some new paint to make it look decent don't flood it with paint. My radiator is stock and appears to be the original 1957 code, I have trouble in the winter keeping it up to full temperature, I use a cardboard winter front with a 10" round hole in the center to help keep it warm, original 283 with stock fan and no clutch.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy