Thanks a lot Chris.
Is this what I'm seeing?
Crank Pulley - 3 grooves (I know my 66 pulley P/N is different from yours though)
Water Pump Pulley - 2 grooves (I know my 66 pulley P/N is different from yours though)
Most rear groove = crank + water pump + alternator
Middle groove = crank + water pump + power steering pump
Front groove = crank + A/C + A/C idler pulley
Is this correct?