The clutch fan will cost you some horsepower under acceleration load, but will probably cool pretty well. I'd be looking at a good electric, maybe even a pair of pullers, if you want to avoid that parasitic HP loss. Rick is correct about the electrical part of the equation; if you are going to run a couple of good electric fans (like Spal fans), you will need at least a 100 amp alternator, and good wiring to the fans and fan relays. Unfortunately, its not just buying the fans...