Edelbrock perforner rpm vs air gap

I would say that getting good power gains from porting a dual plane could be difficult. Too many areas are inaccessible. I'm posting a link showing the before and after results of porting three different intakes ( small block shivies ), one of which is a Air Gap RPM. Flow bench and dyno test. At 6000 rpm and below, the ported Air Gap made less power than the OOTB version. https://www.motortrend.com/how-to/hrdp-0802-chevy-intake-manifold-porting/