Slightly strange head flow question.

there is a point when the flow wont make a diff. that point is when the ve (volumetric efficiency) is 100% or close depending on your combo of parts. some engine will be even higher then 100%. rare for most street engines. as far as the flow numbers for your engine and what it can handle is a guess at best because its related to the parts your using and what rpm you are achieving your hp numbers. my opinion your engine could easily see a increase from 300 cfm head flow. question is now how much increase. that's the million dollar question.