Fuel pressure regulator plumbing : 850 Demon with a Carter mech. pump

I appreciate the responses.
The car is actually a 70 Charger. The replacement vent line has been capped since 2003 when I installed it. There are many 70 and 71 model Mopars like mine that have that strange vent tube in the trunk with 4 or 5 lines running to it. Mine is there and still functional. I have the stock type gas cap.
I am just going back and forth with whether or not to keep the Carter pump in there. The Holley ran decent pressure and required no regulator. I just thought it might be a contributor to the fuel starvation. Fact is, the car only bogged twice on me after several full throttle runs. The pushrod was the right length though so I thought maybe I needed the carter pump.
The reason I posted here is because the member traffic here seems to be twice what I see on FBBO. Thanks for any advice you are willing to give.