which heads for a 408ci?

Got the 318 heads to flow a max of 214cfm at .700lift 209cfm at .600 and 206cfm at .500 lift. I got these numbers with fully ported bowls and tear droped it around the guide and some short turn radius work. haven't even touched the runner yet It flowed 177cfm stock max at .500lift. Haven't gasket matched it yet I good still or done anything to runner openings all stock runner. this is with the 1.78 intake valve still.