Lets see if I can get this right, The caster is adjusted by the shims that should be between upper ball joint bracket and the a arm moving these front to rear will change the caster. My early 71 has no shims from the factory and no way to adjust caster. Camber is adjusted in the same area . The two bolts going though the upper ball joint bracket in the a arms should be slotted to allow adjustment. May not be visable with the washers and bolts installed and many the vendors have a kit that mounts on the upper a arm that makes doing this adjustment easier (camber lock kit). You’re right on the toe it’s adjusted at steering rack.
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