There's no problem using the late discs with the early sway bar. You have two choices. Swap the spindles to put the calipers to the rear or run short sway bar links. This swap has been going on for thirty years on early cars with sway bars.
People do all kinds of things. Swap spindles to rear, brake lines and routing? Short sway bar links, lose turning radius? I would not, but you or anyone else can. I don't care. I've been swapping brakes for 35 years, 74 Duster to 64 Barracuda, no big deal...
