CFE already has. Their billet Yates head outflows any LS head by a wide margin. Note too they have other makes of outlaw racing heads and blocks and billet blocks too. The Storm King head can do over 430 CFM on a 4.120 bore SBF. No FE heads of course but......
Hang around the Pro Sportsman's ranks and high-end Sprint car crowd and you'll find lots SBF's running CFE's heads and (drag racing) sheet metal intakes. The heads cast or billet accept mechanical F.I. down nozzles well, a must for Spring Car racing. Btw, a really good all-aluminum 410 CID SBF with mechanical F.I., ready-to-run will set you back $35,000 these days.
http://www.cferacing.com/?pid=67Btw, if you really want a kick in the pants, check this 600 CID SBC article. As you read it, take a close look at the intake and exhaust port size, shape and spacing. As time has gone on, the Chevy crowd has slowly moved into the Ford Cleveland camp (an over 45 year old design!) as today's hottest non-LS engines sport identical heads and chambers to modern design Yates/Cleveland architecture! Heck, they have even dropped the Chevy firing order and rear mounted distributor.
And while the LS series is a hot engine, the hottest SB Chevys running in Pro Sportsman's and Sprint Cars owe nothing, zero, to the LS designs. They also have CFE type heads or similar canted valve heads ala' the Yates/Cleveland designs and they too flow well over 400 cfm.
As a Chevy guy told me LS's are for streeters and wimps, pro & real racers run CFE! LOL!
http://www.enginelabs.com/news/cfe-develops-600-cubic-inch-small-block-engine/