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I believe with A/C and a turbo, and especially in hot climates, you might want to consider replacing the OEM engine-driven fan/clutch with a radiator-mounted electric fan. For my Supercharged P400 / 765R4 / NP241 drivetrain swap, which I am anticipating will need a copious amount of cooling capacity, I have installed a new Derale #16843 High-Output Dual electric unit with the #16797 controller which will pull 4800 cfm through the radiator as needed. The controller has a thermostat which glues to the radiator tank and monitors the tank temperature and subsequently adjusts the fan speed accordingly to keep the tank (and the coolant in it) at a constant acceptable temperature. While you may not need an electric fan with these cfm capacities, a conversion from the engine-driven fan to a stand-alone fan will undoubtedly help. You should also remember that when the fan clutch locks up, it steals horsepower to turn the fan. Just my 2 cents. Hope this helps and adds enlightenment.
