I've driven 2 of those cars. Happens to be friends of mine that owns the 66 coupe with Roush Yates Nationwide motor and the 68 fastback with silver stripes. It was cool watching those when they came out.
If you look at the upper strut mount the measurements between studs are different and if you rotate it one way you'll get more camber turn it the other way you'll get more caster. You can also unmount the struts from the uprights and elongate the upper hole and get more camber that way.