This is an AFCO 26X20 I put in my '57 (Summit part# AFC-80103NP). The fan is a flex-a-lite 180 (3300 CFM). I needed to make a couple of backets to adapt the rad to the core support, but it was an easy fab. This rad doesn't have an auto trans cooler.

http://picasaweb.google.com/ChrisAurit/ItSChrisGreenTruck#5242121123234200946