Underdrive performance W/O alt. pulley.

[Shotgun28]

With my new ASp underdrive pulleys I was told they run prety hot, and was wondering, what is the performance difference not using the Alt. pulley and just using the other two.
I still have the stock alternator and was just trying to get some views, I will eventually get a new powdercoated PA alternator, but for now I am stuck with the stocker.

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...