Off the top of my head, you'll need to change the alternator wiring. The V belt ones pivot to adjust the belt tension. The ones for serpentine belts bolt down solidly. They don't move since there is a belt tensioner pulley. The V belt alternators are 1G while the serpentine belt ones are 3G. If you've already converted to a V belt 3G, then you may not have to rewire, but I'm far from being an electrical expert. Other than the alternator, I can't think of anything that has to be rewired.