new here and i've got a trick for ya'll
i wouldn't use any rear with c-clips. might as well use a shivvy 10 bolt, there everwhere also. Im sure you can find 8.75s i bought mine for $100 at a swap meet. Can't you just take the brakes and make new mounting points and add them to the 8.75.
steve
(its a a-body 8.75 of course w/brakes and axles (small blot pat.) and $50 for my posi 489 center chunk 3.91 gears, just keep your ear to the ground!)