Which style bracket is your A/C compressor mounted on? I see you read the thread from a couple years ago (
http://67-72chevytrucks.com/vboard/s...d.php?t=472147) on this topic so you know why I'm asking. If It's like the one pictured below that is the original on my 69 3/4 ton with 350, I can check my pulley numbers and even post some pictures of the pulleys in a couple days.