just got my car so I'm dealing with someone elses handiwork. When I rev the engine up it throws the belt that runs the alternator and water pump. The pulleys for the crank, water pump and power steering all seem to line up fine. The alternator seems to be a little off though. It has all OEM pulleys and brackets. Except the alternator has been changed to a polished aftermarket unit. It has the correct BB alternator brackets and spacer on it. Is there specific alternators just for big block cars? At this point I just don't feel safe driving the car until I can keep it from throwing the belt.