Holley Avenger Carb and Nascar Fuel Pump

Two quick questions;
1) What basic engine combo are You running, c.i./cam/heads............
2) Is that regulator a "dead-head" type only with fuel gauge/NOS gas taps, or can it be run as a return type setup
Thx.............................
410 stroker, edelbrock heads, 230/243 hyd roller. Im sure the reg can be run either way.