Four Crabs, all loading fuel at bottom of intake

Need some thoughts. Every carb I have tried is bogging at idle and above and leaving fuel at the bottom of the intake. Floods and stalls. 3 Edelbrocks, one Holley and one Slayer tried. What I have is:
- rebuilt engine and components
- RV cam
- 906 Heads (rebuilt, ported and polished)
- MSD 8387 Distributor (tried two, no difference so kind of eliminated an electrical issue)
- edelbrock #7193 Performer RPM intake
- vacuum is 16-18 hg (steady when timing is pegged, no bouncing)
- timing...

Four Crabs, all loading fuel at bottom of intake
Author: sprice