Do a search, there are a few posts on electric and flex fans. I personally would just make sure the stock clutch is in good operation and call it. I ran a flex a lite black magic for a while and it never cooled as well as a stock fan. Never. If you do want the extra insurance, go with rock surfer and install a thin pusher fan in front of the radiator.
Also key is a good mechanical temp gauge. They are much more acurate than a stock gauge. Accurate enough to watch the thermostat open and cycle.
Thinking about it now, I think some toyota trucks/4runners came with pusher style condensor fans from the factory.
Also keep in mind the extra load placed on the alternator when using an electric fan. My F-A-L fan drew a max of 30 amps I believe. Early trucks ran a 40 amp alt where as the later trucks ran a 60 amp alt. Still not a lot left over either way.
