Magnum VS Hemi

An EFI system requires a specific fuel system regardless of what is at the end of the fuel line, so I don't see how, in regards to the fuel supply system, a Magnum swap is any cheaper than a Hemi swap if you want to keep the EFI.
True. I have a whopping $600 in my entire EFI setup, since the motor came with a 2bbl.

The reason Magnum MPI is cheaper than that for a Hemi is while it's true in both cases that it's cheaper to keep the MPI, the Magnum is even cheaper to keep the MPI since the injected motors cost less but the OBD-II doesn't hardly seem like a horrid performance EFI system.