[FFD]

http://www.mark7radiators.com/ hit spec form you kinda can see what you need

[Lemans64]

I used a northern rad race pro 19 inch for my 64, it's a cross flow 26 x 19, 19 high and 26 across. They also have a custom fan shroud kit u can buy with it. Used stock 3 core upper and lower mounts, with 2x3 aluminum tubing for a filler in the bottom, and aluminum filler channel in the top, (also northern rad supplied,). Custom fans shroud was welded together by local welder.