Kool Beans,
A)Distance from Radiator support mounting surface to water pump pulley mounting surface 6 1/16"
B) Hayden Viscous drive Clutch Fan Height = 2.670
C) Aluminum Rad width = 3.000
That seems to be a little tight for clearance to rad.....I am no fan flex expert, but your fan does flex when you apply heavy RPM's. Not sure if this flex or "growing" goes toward the rad or back to motor away from it. You may want to test without rad in for a moment and give 'er some throttle from under the hood and watch the fan.