Any tips on moving the alternator to drive shaft for charging?

I have a Chevy S10 and I want to get more horse power. I was wondering if anyone has any thoughts on moving the alternator so that the drive shaft (which runs anyhow) turns the alternator to charge the battery.
It is my husband's idea. He likes
The only way (not by drive shaft) to eliminate the alternator when horsepower is needed, is to put a switch on the output of the alt. When you want to go, turn the switch off. To drive normally and to charge the battery, turn it back on.
Lab | Oct 14, 2006