Help with stock EFI

Not necessarily. Ford trucks and MBZ used external inline pumps. Ford strapped it to a frame rail. MBZ hung it in a vibration insulated scrodum next to the fuel tank, the bigger motors got 2 in series. These Walbro pumps can be had for under $40 online. You will need a return line.
Good point, I mostly see complaints of burned up inlines, but don't hear about reliable cases.
-Anyway, Truckie here is a pic of Badass71's fuel set up. The stock pump has a telescoping base that allows some flexibility for the depth of a fuel cell. One can either use tabs to hold down or graft the donor tank mount. The pressure would be correct, no need for return line, and all part of the harness. Just an option.

pump.jpg