418 Stroker options....

Just my opinion but if a blower engine is your goal, build it as a blower ending and just run around with really low compression until you can stick a blower on it. I would not want to run a .120" gasket with 4 bolts around each hole, under boost. even mild boost. You will have to have pistons customized because I don't know of any with a deep enough dish off the shelf. But you'd do better to have something that runs 7:1 static then something that runs 10.2 and then gasket up to lower it.
Simply put you cannot have your cake and eat it to. You can give up some power now, or give up reliability later. Choice is yours.