It took two years plus to kill the original, o.e.m. alternator on my car with the Contour fans. Personally, I would recommend keeping the stock clutch fan.
For the person who said their clutch fan quit working, there's a write up by Jetjock on how to rebuild it, if you search around a bit. Pretty simple, and cheaper than buying and wiring fans. Buying a new clutch for the stock fan would be cheaper than the initial wiring, relays, switches, and fans to go electric, and easier, to.
With the Chevy motor, a high output alternator should be pretty cheap, if not factory installed.