Viscous Fan Won't Fit

I have a MP fan blade with the jaguar clutch that's going on my new 383 when it goes in this spring. I know that with a big block space between the pump and radiator is tight to begin with, but it looks like I'll be 5/8" from the rad with the clutch. Never thought about the radiator up top. I do have the original fan from my car (72 340 duster) that I'll have to use if its too close at the top. FWIW, both fans are the same diamater, 18 inches. both place the blades the same distance from the radiator, but the oem fan has the little cutouts at the end of the blade. If you do decide to try to trim yours, make your self a template for the removal, so you'll take the same amount off of each blade. If you're careful, rebalancing won't be needed. I'm using a 26" b body radiator and shroud. Hopefully it'll be a little taller than the smaller rad.