All in all its an easy enough fix by the sounds of it. Maybe while yer waiting for pics post up a want ad for the correct centerlink and steering box...might help shorten the down time a bit..
I think I'd hold off until he is 100% sure of what he has now.
He does have a 68 Manual steering box with pitman arm. So he would need a 68-72 centerlink and 68-72 idler arm.
Until we get a picture to confirm, it seems he has a 73-76 power steering box, 73-76 centerlink, and 73-76 idler arm. But stranger things have happened.
straightlinespeed, you do know you will need to change to manual steering column or manual steering column adapter from www.firmfeel.com ?