Clutch fan options on my 340?

Thanks all. I appreciate the clerification on clutch fans, so ultimately i need to buy the five blade fan and clutch setup in the link rusty gave me and replace the clutch. Also how do these things hold up to high rpm? Ive never seen 5500 in my demon but the cams good till 6200, havent had a problem with the fixed fan and im sure any factory chrysler fan will hold up to it but im a little leary on the fan clutch at higher rpm, maybe im just too cautious but i deff dont want to replace a 300-400 dollar radiator.

I also have a question in general about the fan blades. Are the pitch of the blades the same between the 7,6 and 5? Or is the less number of blades the greater the pitch?