Pressure Regulator

If you need to prove it to yourself that way, go ahead.
Combine or seperately with TrailBeast's suggestion.

Everyone learns differently so do what you need to.

I've driven a couple of times relying on gravity feed - that's easier to rig with single inlet carb

All the carb needs is fuel in the bowl. It's pretty much like a toilet tank. Whether the toilet's tank is filled by a supply line with 100 psi or 20 psi or a bucket doesn't matter much.
The hieght of the fuel in the bowl only slightly effects the delivery to the engine. Air pressure does most of the work. If the pressure is effecting the hieght of fuel in the bowl, adjust the float. This will slightly effect AFR, lower level will be slightly leaner.

A good explanation and illustrations of the carb operations from Chrysler
Carburetion Fundamentals & Facts (Session 273) from the Master Technician's Service Conference