I just got a12 valve built and and head redone. They decked the head and also decked the block. Can i make up what they took off with a marine head gasket , like a . 10 over?They told me that they usually seat the valves in deeper to make up what they take off the block and head. Should i be worried about valve clearence?I would like to hear some thoughts on this . And does anyone have the part #s for the marine head gasket?