posi rear gears 7.5 8.5 10 bolt

I got a 79 cuttlass, with a 10 bolt 7.5 rear end what posi can I put in one of these?

Will someone please refresh my memory? If I pull the stage 3 summit center out of my 87 Cutlass what's the tallest GM gear that will go on that unit it has 4.11s now I want highway gears when I put it in the 78