I'm adding power steering to a 1953 F250 with a straight 6. It's already had an alternator conversion done, so I'm planning on moving the alternator up for clearance and installing a p/s pump below it. I should be able to mount the p/s in a fixed position as it'll be run by the same belt as the alt. The belt could then be tightened by adjusting the alternator only. This got me to thinking- is there a minimum amount or % of the pulley that the belt needs to cover? The belt will only be running on the crank, p/s, and alt. Hopefully this makes sense? The only other option would be to scrounge up a triple crank and double w/p pullies which I'm guessing are like hen's teeth.... Thoughts?