When you're doing a return system you typically place the regulator after the carb supply, before the rest of the return line. This maintains the pressure throughout the entire carb circuit.

If you look at any fuel injected car's fuel rail, you'll always find the little pressure regulator dampener at the end of the rail.

Unfortunately this requires a "return style" regulator - you can't use many types of deadhead regulators in a return-type configuration from what I understand, since they aren't designed to maintain pressure under constant circulation.

Here's an article that details the differences between the regulator types:
http://www.onallcylinders.com/2017/01/12...e-fuel-systems/