Install the tie-rods with the short tie-rod outboard. Big-block inner tie-rod ends are attached to the highest point on the rack's center. Small-block inner tie-rod ends are tied to one of the lower attachment points. The reason there are two lower attachment points is the Mustang's wider track from '67-'70. If you have a '67-'70 small-block Mustang, inner tie-rod ends go to the inboard attachment points.