I'm going to reuse my C-body 440 auto radiator. I purchased a 17" Ford Thunderbird electric fan by Dorman 620-118 for $56 on eBay. It was brand new and only a step down from the Lincoln MK8 fans in terms of CFM. The MK8 is 1500 low and 2700 high. This will be more than enough, and the megasquirt will be controlling it. No need for any external boxes.