Help with stock EFI

Yes it will work and some have had success going this route. Maybe someone will chime in that did it that way. They key is to get the fuel pump in the tank to keep it cool. If you have room in the trunk, a ebay fuel cell is affordable and you can simply cut a hole in top for your stock pump, vent it, etc and use the wiring and hose you have from the donor and you are done. I would have done it this way but my trunk would not allow for it.
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.