Do I have a 73 and up or 72?

73 - 76 had the swaybar thru the k member and the control arms have the swaybar mounting tabs on the top edge of the control arm. The earlier models swaybar went in front of the k member and the swaybar mounting tabs are on the bottom edge of the control arms.
If the bolt on the idler and pitman arm is on the bottom side of the center link it's 73 up. If the nut is on the top it's 68 - 72.