Needed: Vacuum hose diagram - '73 Duster 318 2bbl

anyone have any clue where to find this vacuum diagram at?? My buddy Derek really needs this to get his Duster sorted out. I've been trying to get him on here to no avail so here I am posting looking for a vacuum diagram to his car, or something close enough. Any help here would be really appreciated, I cant seem to find it anywhere on here or on the net. Mostly diagrams for slant 6s.