I was told by Rich at Fastman EFI to not dead end fuel to either fuel rail, it needs to circulate back to the tank through both rails so one side of the motor doesn't see different fuel pressure than the other
I'm plumbing a hemi motor for dyno testing now and will rearrange the fuel system and wiring after this once the motor is in the car.
I'm routing the fuel feed from the pump through one side fuel rail and then looping it on the back side to the other side and then back through the regulator and then return it to the cell
Lots of fun joining this generation of fuel controls
Better now than later