I have fuel regulator in front. It distribute -12 supply line to -08 lines to pumps and -10 return line.
Block on top of engine is collecting return lines, from heads and pumps return flow come -06 to it, and goes -10 to tank.
I am waiting some fittings and have not completed system yet, so no pics yet.
Did you make a new high pressure line for the rails or are you still using the factory junction block? I am trying to find a way to delete the factory high pressure block and clean the valley up for more room.