you'll need the 1st gen f-body spindles, steering arms, f-body upper ball joint, longer tie rod adjusters, probably a bump steer kit because the spot for the tie rod end on the steering arm is not tapered but 1/2" straight and you'd need f-body brakes. You'll save around 15lbs with the spindles swap plus whatever you'll save on the brakes if you're using stockers now.
see my thread a few down from this one.. I had TRZ do the spindles setup for spindle mount wheels/brakes