I had to fab it in on the left side where the air pump emissions piece would go, the bigger delco's won't fit in the stock position, Downey tried like hell to make it happen.

Wire's,  one is the battery, two is a the wire from the regulator to the battery, these usually are what's called self exciting, they turn on and off when the pulley spins (this is the easiest set up).  Three, is a wire set up as an on and off switch, deleting the self exciting system, I run this set up and  I can turn the alternator off and on when I want,  Reason I went with this system is that my MSD ignition wouldn't turn off the motor without the the alternator being off as well (go figure)

Summit Racing has some good priced powermaster delco's  100 amp for a $100.