Big horsepower 318 builds

I am far from a pro builder but how about some zero deck flat tops or slightly dished with the Speedmaster/Edelbrock design heads. You could use 920's or 302's but they are cast and obviously require porting to make them as good as the aluminum's.
i think 400ish hp the max any body get with the 302s and 920s! thay run outta material to grind outta them heads for thay open up enuff to make any more! the 302s HR ported for there junkyard jewel cracked up shortly after there artical was printed! now id love to see a 318 with a well ported streetmaster head and a max effort build! heads make the HP! bore an stroke determine when in rpm range it makes it!!