The March "Power and Amp" pulleys ensure full charge at idle. Mine are aluminum, part no. 2015, but you can get them in steel for a little cheaper.
If you already have a 130 amp alternator, you don't have to worry about pulleys affecting charging. I believe the 130 amp alternators were equipped on '94 and later stangs.
Good luck!
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Russ L
'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.
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