Head flow and power differences question / discussion

I run 117 at 3353 lbs. Calculator says 519 RWHP. Which seems pretty high to me. The heads flow 274ish average. So 1.9 hp per cfm seems close. The thing is my intake is considered “not great” which is probably accurate, but the intake tract starts to flow first at the valve opening. How much depression signal the head can create impacts what the intake will flow. Higher depression, more flow. You almost can’t have “too much” head flow in a LA motor and “excess” head flow can overcome a “not great” intake. Of course there are limits, the velocity gets so high turbulence or fuel separation occurs. It seems to me it is a pretty serious build albeit not a dedicated race car. I would go bigger CFM head. Gives you room to grow or if car usage changes. Just my two cents.