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The engine being under higher load can demand more from the electrical system -- but I could be thinking in terms of points and condensor ignition. Changes in voltage can result in a weaker spark, which is the last thing you'd want.
Another mod that could be worthwhile (for those of us who love our forced-air HVAC) would be to replace the blower motor with something more efficient, or to lighten the fan blade assembly to reduce the torque needed to turn it. Maybe even to add an ultra-low speed to the blower motor so the A/C can be run with minimum blower electrical load. Most A/C will not engage the compressor if the fan isn't running, so to have a fractional amperage fan setting, or even an override if you're in the "Fresh" mode so that the A/C will run with the fan off, can save some electrical demand.
Tie the fan speed automatically dropping under high engine load with the alternator cutting out under the same conditions, so that you're not burdening the battery so much up those hills, and downhill, the battery recharges just that much faster.
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