How close is to close?

Mancini sells the stock pulley in black or chrome. They are thin at the base. You will pick up a 1/4 inch in clearance. I have the jag clutch with stock pulley on my setup. I have 1 inch clearance. I use a custom shroud and the fan is half in and half out. Perfect setup. I run 180 degree temps in 90 degree weather.