swapping a complete wiring loom for another complete wiring loom isnt difficult, if you can swap a tank and lines then you can do the wire swap with absolute ease.
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theres already a return line.like paul said there are already 3.your carby car still has a mechanical fuel pump (on the engine),this fuel pump,while not as high pressure as the efi electric one,still pumps way to hard to just be feeding it into the carby,so there is still a return line to get the fuel back to the tank that isnt needed in the carby
very good info on this subject teh_mechanic, helped clear alot up for me. Trying to give u rep points but i need to spread some first lol.