Going 68 k frame, big block, tti headers, so I need a manual box. I picked up 2 manual h xes some time ago and thought they were the correct ones, that's why I'm trying to determine what part number boxes are correct for 73 and later.iThe steering linkage I have is off a 73 and later Duster. At least that was my plan. If the box I have is the small sector, could I just reuse the 67 center link and later tie rods and be ok? I'm trying to get rid of the smaller weaker parts that were bolted on my 67.