63ChevyII, Hey I had the same issue with my install. The solution was to get a double groove pulley for the alternator. I went to local carquest and they had some in the back and even gave it to me free. A lot of times when customers get new alternators the pulleys are different and so they swap them out if need be. Never had an issue with the double pulley, it should definitly solve your belt allignment problem.
-Ted
