CrossRam/Pro-Jection Question?

[JW69Camaro]

I have a 406 with 6" rods -10 Brodix heads that flow 310 cfm at full lift and I"m putting a crossram on my car with 2 Pro-Jection units. My question is should I run this in an open loop config or closed loop. This is my first dealing with fuel injection so I thought I would buy a simple unit.