Wow, glad I asked the question. Lot's of things that I wouldn't have thought of and that I need to consider.
Salmon, thanks for the input on the torque concerns....that certainly makes sense.
USMC Ordy, not sure about the originality of the radiator, but I would suspect it's not original.
Desert, thanks for the link to Hayden. To me it looks like what they call the "fan height" is the issue (distance/length between where the clutch mounts to the water pump/pulley assembly and where the fan mounts to the clutch). Mine is about 1.5 inches and I would need that distance/length to be about 2.5 inches to get the proper fan blade depth in the shroud.