New Heads / Belts Dont Line Up

Swapping to a dual-groove alt. pulley might do it if you can't get the alternator moved back far enough before it hits the head. I have LA Edelbrocks on my 5.9 Magnum and although I did have to play around with cutting spacers and adding/removing washers I was able to get my dual-groove alternator to line up on the rear groove without much trouble.