Replacement 360 crank Pulleys Q

[DMZ73]

So the more I dig, the more I find. Murphy's law I guess.
I have a 72 360 la engine that did not come with AC. My
Car however, did come with AC. I see that the alternator also has a single groove. I know that AC cars use the 2 groove alternator pulley. Common sense tells me that I  need to replace the crank Pulley to a multiple groove crank pulley. Do I choose 4 groove or 3 groove?
BTW- I also have power steering.
I saw the buchillion performance website has replacement pulleys for sale.
Something caught my eye: there was mention that you need to replace the crank for some specific application. Which, I can not remember.
Can anyone shed some light on a solution?
Thanks,
Dan

[Chryco Psycho]

I do not see many AC cars up here , I think most multi groove lower pulleys are 4 groove

[DMZ73]

thanks Chryco.
I know everyone says why bother. My car is an Arizona car, so it came with AC. Up in SE Michigan, the summers can be really Humid. I want to be cool on those humid  days. I dont like being stuck in Woodward cruise traffic with no AC either..
I don't expect to get everything from the AC hooked up right away, I just want to be prepared for when the  time comes.

Do I need to change my crank?

Thanks again,

Dan

[Chryco Psycho]

I cannot think of a single reason the change the crank out