As far as the wiring, most will either just tie it up out of the way or trace it back to terminate the wires at their source.
I personally had to modify my bracket, but I had already switched to serpentine setup. As far as I know not much should have to be done as the mounting points are similar center to center, it's just the body that's much larger.
The squealing sounds a lot like a missaligned belt as stated- I would find a large straightedge or level or something and see exactly where the alt pulley sits in relation to the water pump... I'm gonna assume it's off.