I was assuming the Edelbrock carb has a lower MAXIMUM fuel pressure at the inlet. The MAXIMUM fuel inlet pressure with a Holley 4150 and 4500 series carb is seven pounds per square inch. I set my adjustable pressure regulators for only FIVE psi not seven at the inlet of my Holley 1150 cfm 4500 series Dominator carb. The maximum fuel pressure is a function of the float's buoyancy and the length of the lever arm. A bigger float can generate more lift but it occupies more volume best used by fuel in a carburetor.
You want volume not pressure at the fuel inlet. I run a half inch line with a three eighths return line to obtain the volume of gas that a 750 horse normally aspirated big block requires. A carburetor has zero gauge pressure inside the fuel bowls (one atmosphere pressure). You do not need any more pressure at the inlet than would be required to pump gas through the small diameter of the seat that the needle is pushed against by the pressure of the float on the end of a lever arm. I also replace the gas needle and seat with the larger diameter hole used with an alcohol based carb from Holley to increase fuel flow through the carb.
With my Aeromotive A1000 electric fuel pump I have to turn the pressure at the carb down from 46 psi. Because a three eighths fuel line is sufficient to return the unburnt fuel to the tank under the amount of pressure my pump puts out I do not stress anything (heating the pump, aerating the fuel in the fuel cell or running out of gas).
A stock mechanical fuel pump out puts less than five psi at WOT. It is designed to handle only 350 horsepower in terms of fuel volume. The fuel pressure is constant as it is supplied by a spring, but as with valve springs they have harmonics and can vary the load if the pump encounters a harmonic in normal operation. Problem is "normal" for you and what the engineers had in mind back in 1953 when it was designed may differ.
Aftermarket pumps are plumbed differently internally. They have up to five separate reed valves to move fuel from the low pressure side of the pump to the high pressure side to increase the fuel volume as well as having larger inlets and outlets than stock pumps. The stock pump has only a single reed valve to allow fuel flow and that is the biggest restriction in it's design. The aftermarket mechanical fuel pumps consisting of Edelbrock, Carter, Holley and others also out puts fuel at a higher 6.5 psi instead of the more common 5 psi used in stock service part replacement mechanical fuel pumps.
The BBC fuel pump and some high horse small block fuel pumps from Chevy had a return line built into the base of their mechanical fuel pumps to optimize fuel volume. As soon as the pressure reached it's preset 6 to 6.5 psi a valve opened returning the unneeded fuel to the tank.
Otherwise I agree; all fuel pumps are the same.