Need help with edelbrock 1406 carb

Dragtop,
You probably didn't get lucky by not having a reg. The FACT is these carbs will handle 10 psi. I will see if I can up load the Carter chart that says so. I have run 9 psi at the drag strip, zero issues, as a quick test to slightly richen the mixture.
[1] Carter recommends on all performance applications to use a hi delivery competition series mech pump 7.5-8.5 psi & 85 gph fuel flow with 7 psi elec pump mounted at the pump to supply it.
[2] Carter mech race pump, M4862, 8.5 psi, for Chrys BB engines. M6903 street pump, 6 psi.
[3] In my Motors Manual, the hemi has a 6-8 psi pump; many other pumps for AFB equipped engines have 5-7 psi pumps listed.