[s-cars] Viscous fan clutch has gone bad. Electric Fan, anybody done it???

[Emmett03 at aol.com]

I'm thinking rather than to replace this expensive inefficient fan I would just install an electric fan in its place. What size serp belt would I install? How hard is it to remove the fan, special tools? 

I've found a price of $100 for the clutch and $50 for the pulley assembly.  Which one of these would cause a noise, only at idle.  The noise sort of sounds like a knocking, which I thought was the motor but the noise went away when the serp belt was removed.  Also, the fan is loose, I'm not going to drive it anymore in fear that the fan will break apart and destroy the radiator.  

What have you all done???

Thanks for your help.  Emmett