Highest flowing sbm heads?

Hysteric said

The floor is very flat on my Edelbrocks which surprised me but they managed 288 cfm on a 10 " bench. In my view there's more than enough airflow available to make power but actually using it is another story. Dan Smith has a set of Eddies running 9's but says he prefers the 587's himself and looking at how his car runs has no problem using everything the head provides.

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I got rid of all my stock heads years ago for 50.00 as it was a bunch of mismatched take-offs. I was always afraid I would try to do something stupid and see what I could do with one. At that time I didn’t have a valve seat machine to do the needed work for free. (My labor). Several Mopar guys have great running engines with modified cast iron heads so we know it’s doable.