72 A/C 340 Demon fan/clutch space?

My 72 Demon 340 with Classic Air and stock radiator has 3 1/2" of clearance. I have a Mopar clutch fan with a stock shroud.

It's tight, but does fit......

From looking at your pics, I'm wondering if you could run a deeper water pump pulley? :scratch:

My problem with pulleys began with the Edelbrock heads which project out front an addition inch over the stock. So the new aftermatket compressor and brackets including alternator and power steering had to be played with and shimmed. The pulley I have is real close and won't move in either direction. I think I am just going to try a aluminum spectra 18" fan and see how it cools with no shroud and then I guess I will have to go from there depending on the results? But all I got for space is maybe an eighth under 3 inches. Might be the aluminum radiator is about 2 3/4" thich and I think your stock one is 2 1/4" thick. There is the 1/2" extra you have. Make sense?