I talked to someone at www.etheads.com because they say they can cnc the B1-b/s to 355 cfm @ 0.700".
They told me that was with max wedge port size.
I already have the Manely severe duty 2.25" intakes and exhaust valves (the larger intake didn't help flow on the Stage1 (basic port cleanup) Koffels ported heads I have.