When my DMCH all-in-one pump stopped putting out enough pressure last summer, I installed this one:
Spectra Premium SP6170M Fuel Pump Module for Chevrolet/GMC
https://www.amazon.com/dp/B000IYQJUS..._3c2SCbDDESEHD
It did need to have the black fuel pressure sensor on the top removed (pops off) and plugged with a bolt, and I filed down the tabs around where that sensor was. I also had to trim the plastic tab off the side of the pump. I am using Hervey’s fuel sender now, as the float was reversed on this one.