I know that
Greg Young at ZZ has mapped out the whole DuraMax engine, and the oil pan He was designing for me before I was asked to become a team member of Banks Power, looked nice, with a 3/4 inch 7075 aluminum block girdle as a option. Banks also make a neat billet dry sump pan that strengthens the bottom of the block
I believe that 1200 to 1300 hp @ 5000 to 6000 rpms is very possible