Slant crankshaft damper and pulleys

I have to go with Dan on this. If factory A/C, it ran off the aft pulley. All slant six factory A/C was this way, no mater what year or model. Alt, ran off the Balancer groove, and PS was on the front pulley. There were a couple of variations on truck dampers, but the A/C still ran off the aft pulley.
Aftermarket A/C different story.