I am feeding the rail off of the pump side of the regulator, just like the factory setup. However, I am taking my return line off the regulator, straight to the tank. Two reasons...cleaner install of the rail plumbing and no heated fuel returning to the tank.
As a result, I get heavy pressure pulses in the rail when the injectors batch fire. The car runs fine but the pressure pulses could make the throttle response poor/intermittent, and mixture control erratic. I thought about adding a volume of air to the top of the rail via a small container Teed into the rail as a test.
To get an idea about the pressure pulses, I used to run a non-liquid filled gauge at the end of the fuel rail. Within a week, the needle tip snapped off inside the gauge.