Belts Question??

This is actually a two part question. I have a 1965 Barracuda with a 225 slant six. First I am buying a used AC system from a guy who claims that it does not require an idler pulley. Looking at the service manual is anything but helpful in respect to this. My question is whether this is possible or not. He seems to think it goes from the cam gear to the power steering up to the AC compressor. Secondly what are the proper belt lengths for the Fan / Alternator / Cam Drive and the Power Steering Belt. And if it is true that the power steering belt drives the AC Compressor the length for it.