04 cobra turbo pistons

I am going to do a rebuild on my 04 corbra, has a hellion sigle kit on it at 784hp at 17lbs on e-85, my goal is to get it to 850ish on 20-22psi after the rebuild. Im getting a teksid block, i will reuse the crank and rods with arp bolts but im going to get new pistons .020 over. Anyone have any...