Pulley System

I'm not trying to jump the gun here. But I'm going to be looking at a 1972 scamp that a member here told me about. I'm waiting to hear from them. I don't know if it's a V/8 yet. I do know that it's a non ac car and I'm going to have a ac system installed on it and I was wondering where I can get the necessary pulleys and what they would cost. I have the price for a aftermarket system, but I can't find the factory style pulleys. I'm wanting this information to help me with bargaining on the asking price of the car. Going by the photos it looks real clean.
I'm calling B.S. on this- how can you have a price for a system, or be looking for pulleys if you don't even know if it's a V8 or a slant?? Two different animals, and not even remotely interchangeable.