OP wants to go LBP to run wheels he already has, the 11.75" mopar brake set up will outperform the KH disks and all the parts are readily available anywhere and can be ordered straight from DoctorDiff with everything he wants.
And you can get LBP rear disks from DoctorDiff that will have higher quality parts and you get actual customer service if he wants rear disks to go with. I'd much rather spend my money with @DoctorDiff who has been supporting the Mopar community for decades, knows his products and stands behind them.