4 piston in the front 1 piston in the rear on a gen 1 f body, any advice?

[jwcarguy]

I will be removing the factory red powder coated C5/6 rear calipers w/ abutments and Kore3 brackets for 10 / 12 bolt Chevy and drilled & slotted rotors (with 6k miles) off my 12 bolt soon

will post for sale if a buddy doesn't get them?? ( he is broke though!!)