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what ever motor u choose best to keep it looking std and sounding std then
get it registered
then strip it down and rebuild it with go fast bits
the more mellow and std u can keep your car looking will make it much easier when it comes to rego

and if u want the carby loom down the track just remove the efi inlet manifold and
fit a carby type manifold and just disconnect injectors and turn off the error codes in the ecu

on the gm lsx motors its easy to run ecu for rest of motor and carby ontop but do your research as if u wnt to go this way u can run an ls1 ecu on a later motor and run a cable throttlebody and not have to worry about fly by wire