X-heads enough for 408 stroker?

Hi Greg. Your idea is like another one of my dozen or so fantasy builds.....if i ever win the lottery....lol.

Those heads should spec out around 66/68 cc's depending on clean up and would be able to keep the compression in check enough to run a milder split duration cam to run pump gas and help the exhaust flow. My vision is to make serious "big block" torque along with the tighter converter and a 3.23/3.55 gear. Shifting at just over 5k, great street manners and able to easily knock off 12's with the weight of a A body. I can always dream......

P.S. a .030 over 340 w/a 4" arm is 416 cu in.....All the better :D.