The option I always go with is an aluminum radiator from eBay. It is (was) $200 including shipping. It looks VERY similar to the original brass ones. I paint the tank and sides with Rustoleum self-etching primer and gloss black paint. I leave the tubes and fins unpainted. It looks very correct and keeps both engines I have used them on right at 180 degrees regardless of weather conditions.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission