Pressure Regulator Location

[corvairnut]

Background: Corvair Engine: using 2 carbs (1 each side) converted to throttle bodies using conventional injectors (Siemens 6 orfice).

Is there a reason that the pressure regulator return is placed after the injectors in a loop? If you put a regulator in the main line and "dead headed" the fuel lines to single injector on each side... would it effect flow ? If I was able to not use a return loop, I could cut the amount of fuel line in 1/2....but that would be too simple. I was going to rework it according to the attached pic unless the "injection gods" here tell me why I have lost it. Sorry about the 3rd grade art work.

Ted