I have a cross ram. Similar to an 8 stack , it has 8 individual runners. I am using a megasquirt ECU. My entire system is plumbed with -6an fittings from the in tank fuel pump all the way to the fuel rails... no issues. I maintain 50psi fuel pressure, a 650 HP motor.
photos in my build thread. in CSX 6079 build.
CSX 6079 build