. Six of one, half dozen of the other. If you have the right pump and properly protect the lines, I see no problems with either setup. FWIW, a carb (on a "normal" street car) needs only a slight amount of fuel pressure to run at reasonable RPM's a few pounds of pressure is required only at high speed. The return line has a capillary hole to maintain a tiny bit of pressure at the bowl inlet to maintain idle, the rest of the fuel flow is returned to the tank, the pressure mounts as RPM's increase to combat the dreaded VL. At some point the return flow will max out due to the capillary hole, but VL is not a problem when the car is moving forward at speed as the air flow through the engine compartment keeps the gas cool.