68 - 73 conversion

68 will work. There are 3--4 pieces that must all "go together." Between 72 and 73, the studs from the idler/ tie rods/ pitman were reversed at the center link

The center link, idler, and pitman must all go together, and the steering box spline size must fit the pitman

Consider reversing the spindles side for side to put the calipers at the rear. This will require different flex hoses, but will then clear whatever anti -roll bar you might install. And I HIGHLY recommend one for handling!!!