Factory fuel pump

The pump has nothing to do with reg. It should dead head at close to70 psi without factory reg installed. Not sure about extra intake part of pump, thats different from stock design I am used to. We use a different filter/reg on our systems, its a jeep part. I believe the vette filt/rg runs closer to 65 # and if I remember the later Hemi uses 58# and the first few years used 48#. What year was your donor?