That is true and I don't thik it would be difficult (or expensive) to build a 750+ hp engine with these heads. A 440 block with a 4.25 crank and flat top pistons should get you there. Use a race cam with .700 lift (limit of the stock valve springs) and a Super Victor intake with a Dominator carb and the engine should make 750. With a valve spring swap the heads should go to .800 lift so with a small investment in valve springs a guy could pick up some more power and drop futher into the 8's. I've never seen a 8 second door slammer Mopar at the local track so I'm thinking these heads cover the vast majority of the market.

(Edit - with the flow numbers that Dwayne posted perhaps these heads are more of a 700 hp deal than 750. Guess we'll know once a few of them get on the dyno.)