1965 273 4 groove crank pulley questions

Beams said
I have a 4 pulley laying around. @macdrew77, I’ll send you a PM to discuss further.

Real question… but I haven’t done any research elsewhere.. 4 pulley is for AC AND PS right, are there any setups if you wanted to go AC with manual steering?

I think the PS was there by default. There are 2 different 3 pulleys but they have a different diameter PS center pulley (single belt AC)