I don't care what the Edelbrock instructions say. I and MANY people have experience in the field that says Carter style 4 barrels do not like much more than 6 PSI maximum. It's simply something that you have to deal with on a combo by combo basis. My experience has been that by about 7.5 PSI, the fuel pressure overcomes the floats and floods the carburetor.
I have experienced it. ANd with a new Car Quest replacement fuel pump.