Just another 2 cents worth; on at least some GM A-6 compressors, to reach the clutch you will need a special tool to get the clutch plate off. I helped my dad with one on '70 Impala when I was a kid. It is a cheap tool, but I haven't seen one for sale in years. It looks like a big bolt with a smaller bolt through it. Hope it helps. Good Luck :p
