For a bodies (at least) the ac cars had 6 inch water pump pulleys and 7 inch crank pulleys. (approximate sizes). I don’t think the non ac cars had the same size pulleys. The water pump pulley I have is two groove, but I only use one. I have power steering and ac, so I use the multi grove pulleys.
The whole pulley thing was a real goat rope for me, if I had it to do over, I might just buy a serpentine setup and be done with it.