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.
1970 4spd Superbird, '69 Charger 500 Daytona clone,2015 Hellcat 6-spd B-5 Blue,1968 572 Hemi Charger,70 GTX 535 6-pac 4 spd,69 GTX 440 4-speed Super Trac Pac Car, 1973 383 Barracuda, and a couple Cummins
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