I've had a same set of March pullies on my car for the last seven years without any issues. Even have the same stock alternator and Ford Motorcraft Silver battery that was new 7 years ago too.
Yes, your battery gauge will read lower at idle than with the stock pullies, but it's never been an issue for me.
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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