The pedal assembly on some of the early Foxes - mine was a '79 originally with a 4 cylinder - is different than those on the later Foxes. The early ones had the pedal arm brazed to the shaft on the left side, and the arm was secured with a nut on the right. The newer ones have the pedal secured with a nut on the left side, and the shaft and self-adjusting unit on the right are in one piece. I used the original pedal, attached it to the later model shaft and self-adjuster, then threw away the self-adjuster and used the solid lever and cable from an aftermarket kit that has the adjustment at the flywheel.
I used the factory Modular cross member and brackets, and only had to drill a couple of holes in the frame for the bracket bolts. The exhaust hit the original Fox cross member brackets, which I cut away with a cutting wheel.