600 edelbrock secondary bog.

Edelbrocks are copies of the old Carters. I don't think you mentioned if yours is the AFB or AVS style.
Out of the box settings are pretty good for a starting point. You might consider going back to them and tune from there. One thing at a time. Edelbrock used to have their carb manuals available online.
Sounds like you are getting a BIG gulp of air without an appropriate amount of fuel. Accelerator pump needs to be good. Rate of secondary opening is easier to adjust in the AVS style.