I am using an underdrive pulley on the crank, water pump, and the alternator, but I also have a high flow water pump and heavy duty radiator and have upgraded to the 130amp 3G alternator from the 94/95 GT. My car's cooling and charging systems work more efficiently than they ever did and I am very happy with my setup.
Since you already have the 3G alternator Scott you should be fine as long as your cooling system is working properly.
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