Aftermarket A/C no PS

curious what you ultimately wound up doing for your a/c. I've got a very similar set up (manual steering, four speed, 318 ci). Im using headers and from what I understand P/S isn't an option with headers.
I purchased the idler pulley from a member on this site. I am pretty far off from installing a/c as I am still doing body work, but I like to have a plan and a goal. Also as usual 72bluNblu is correct, different headers allow for different clearance.