Horsepower limit for out of the box Edelbrock RPM heads

I have a big hydraulic roller cam, mildly ported Edelbrocks with 1.5 rockers, and a gasket matched RPM Airgap on my 408. It made 497 hp and 519 ft/lbs of torque. If I was trying for higher levels (which I might be soon) I would go with a full port job and 1.6 rockers. Just giving an example of what mildly ported Edelbrocks can do.