I know that I am late to this conversation, but in case anyone else finds this thread in their search for information about radiators...
I want to point out that many years ago, I used a replacement 1931 Model A F**d radiator I purchased via the Sears catalog to cool a 1959 283 that was built up a bit. The replacement radiator had no problems cooling that engine. (A local shop at the time said that I needed a $400+ custom radiator to do the job, but I couldn't afford that. It turned out that my $57 radiator from Sears did the job fine.)
