Carb cfm with ported heads?

XE285HL
Preload is about 3/4 turns, I had a hard time feeling zero preload. Maybe too tight.
Pump is the Edelbrock Carter, 6.5lbs max.
I had starvation issues with a 6902, then the Edelbrock until I shielded the feed and ran a return. With the return, the guage was useless, all over the place.