Need some help with high torque 408 build

My 426 stroker I run eddy heads with a stage 2 port work( I've done a bit more on my own) 850 carb and a custom cut cam and it dynoed at 612 570ftlbs at 4200 rpm. Its real important to get the lungs workin because like they said above you won't make chit for power with small heads and carb. Strokers demand a lot of air and fuel.