The 73 up idler arm and pitman arm studs point down and the 68 - 72 style studs point up. A buddy of mine just changed to the 73 steering linkage on his 72 Duster because it moved the center link just enough to clear his hedders. I thought it moved it down. Being shorter, maybe it just tucked it in closer to the k member.
Ryan, just curious...What did you do to fix your problem? Also, what Jim said. I had a 68 Dart that my brother put a 6 qt. pan on and the linkage ddn't clear the pan. He took a prybar and tweeked it down about a 1/4 inch to clear the pan. Had you bought that car you would not have known of the modification. There is also the possibility that your idler arm got bent going over a speed bump or running into a ditch. Ditch? Yeah, don't ask me how I know...lol.