massive reconfiguration time again.

so you should be able to achieve 270's or so flow by .500 or .550

Im assuming they arent.
so if you put 400 into someone who knew what theyre doing.. you could have a 270-280cfm set of heads. or spend 1200 and the hair of the dog is 10-15 cfm?
My 596's aren't stock. I spent a few days grinding in the pockets and also paid to have the machine shop cleaned up as well, but like you said I don't think it has an all-out effort inside the heads that I have. I could definitely do some intake Port matching that would probably help.