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Dean , its really hit and miss with the Pro Comp stuff . The set I have on my 393W were cnc'd and flowed over 300 @ .600 on Pete's bench . I also know of several others that have flowed them as cast heads and they flow in the neighborhood of 250-280 depending on the size of the finished runner and valve size. These flow numbers were not on Pete's bench but on others across the country . These are not the same castings as Patriot is using although I have heard alot of bad stuff concerning the finished product from Patriot on their "Freedom series" cylinder heads.
I cannot mention anything on the Chevy heads because I have not personally seen them .
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