Need help with edelbrock 1406 carb

There are shreds of truth in both arguments. But the facts are that increased pressure increases fuel flow. Think of a water hose and nozzle. But the float only has to control the pressure at the inlet seat which is 0.110" in diameter. This is 0.009503 sq. in. in area so fuel PSI of 6 pounds/sq. in. yield 0.05702 lbs of pressure. Thus, the float only has to exert that much force on the needle to close the opening stopping fuel flow.
I can therefore see why changing fuel pressure is an effective means for adjusting fuel level in the bowl affecting A/F ratio instead of opening the carb and adjusting the float level. Not as scientific as changing needles/jets, but probably a way to tune for changing atmospheric conditions on the fly. This is probably easier done with an electric fuel pump and regulator than with a mechanical pump.
My Carter high performance pump puts out a steady 5.5-6 PSI which seems ideal for street applications. The only problem I have is the check valves get hard in E10 fuel which is the only premium available in Denver.