E58 400 plus HP Dart sport build

Dropping pistons off KB 107 30 over Monday will talk to him about decking block I'm not doing zero deck but I am going to get a bit more pressure and of course I want the block straight as well. He is afraid a bit because its close to 11 to 1. I should without decking be at 10.5 to 1 with a .039 felpro head gasket. So I got little to play with. Run premium no ethanol anyways. Have to make sure timing is dead on is the plan here.