Not really as most of the sensors & anxilleries will match up, the carb wiring is pretty basic tbh only need some ignition live feeds for the carb & inlet manifold heaters. They should run off a relay in the fusebox, I think the fuel pump relay is replaced with one for the carb but not 100% on that, but you could easily run a wire from the battery to an ign. live switched relay somewhere, as long as you fuse it you'll be ok

Whats wrong with the old engine anyway? If the bottom end is gone you could swap the bottom end from the carbed lump ont your injection head and be away
