the 68 could be had with either the old ram assist set up, or, the later ones had the 'normal' power assist.
Some ppl will use spacers to place the box just far enough away that the dimple is not needed, however, this is a vary bad idea. There is also a kit which consists of a plate, but that is nothing but a spacer...still a real bad idea.
I forgot to add that with the later gear box, you'll need to modify a bumper bracket.
Also, the 73 & up box is a bit more desirable since it has variable rate steering.
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