Eddy heads on 416 stroker question

What pistons are you using, I missed it if you did mention it. I can run the calcs on it and get pretty close with that giving you the difference between 63-65cc heads. Usually the pistons are dish with closed chamber heads when building a stroker motor from -16.9cc to around -20.5cc to keep the compression pump gas friendly. Some do however run flat tops for a more radical build/compression ratio from like 12:1 & up