Got this from an article i read take it for what its worth ?
home ported 289's C6AE casting with stock (1.78/1.45) valves flowed @ .500" 174 cfm intake and 153 cfm exhust
home ported 351 with enlarged valves (1.94/1.60) flowed 211 cfm intake and 177 cfm exhust
stock gt40P's stock (1.85/1.46) valves flowed 196 cfm intake 138 cfm exhust BUT they do have more efficient combustion chambers !
anyway that should give you enough info to get you a little more confused ! lol
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