take the dish cc and the head chamber volume plus the compressed thickness of the headgasket you pick and you can figure it pretty close If your staying n/a I'd shoot for closer to 10.5 or 11.1 it'll still be 93 octane freindly and you won't need some wild ass barley streetable cam to make power. you can have the heads milled down or the block decked to get everything where it needs to be.