I was reviewing your picture from this thread and it brought to mind the tie rod adjusting clamps that can be seen in your picture (passenger side) . The driver side are not in view but unlike the passenger side it is very important that the clamps are rotated a certain way on the driver side. They need to be rotated so that the bolts are on the front side of the tie rod with the bolts pointed up and down. This is because if they are on rotated to the back side of the tie rod a part of the bolt (because it sticks out) can come into contact with the power control valve while the tie rods move side to side in the turning process. This can cause a steering binding situation while wearing a groove into the side of the power control valve. It doesn't matter which way it is on the passenger side just the driver side . This is a Factory Ford engineering directive which is also covered in the assemblyline manual. I have seen more power control valve cores ruined (at least for concours) then I care to remember because they have various degrees of grooves worn into the side of the power control valve. This is only applicable to 67-70 Shelby because they are the only ones that came with PS from the factory.