I'll echo what others have already said. Depends too on what carbs you're running. Even 7 psi can be at the edge of what a Holley needle and seat can handle before being overpowered.

I'm running a 6-71 on a 440 with dual Edelbrocks. Carter/Edelbrocks are particularly sensitive to pressure so they're regulated to 5 psi fed from a mechanical HV pump - and constantly monitored with a pressure gauge. I've found this to be plenty adequate for a street car.

For reference I'm running 8.5:1 compression with 7.3% overdrive which results in 6 lbs. of boost and a calculated 12:1 dynamic compression - so it runs happily on pump gas and I don't have to sweat detonation. 6 lbs. of boost may not sound like a lot but it'll keep a smile on your face.