Your depth is going to limit you. The higher CFM fans typically have thicker motors. A pair of staggerd 12 inch fans mounted to a custom shroud may get you there. We just shoehorned a pair into a 70 GTX with a 440 and a serpentine setup. I like Spal and Flexalite fans.
Did you use a premade shroud? or make your own? I planned on using twin puller fans if I can find a shroud that works. So that will give me allot of clearance being offset from the pulley at center.
We made the shroud as there was nothing available.
As far as the Amperage vs CFM comment, There is some validity to the comment, However, a high amp fan motor with a poorly designed blade will draw the amperage but not move the air.
An efficiently designed fan and motor will move the air while drawing minimal amperage. The trick is to find a supplier that does not "FLUFF" their numbers. Again, I like Spal and Flexalite.
Welcome to the world of Cooling
