Tough call. EFI's generally better, but you'd need a bunch of parts off the donor to make it work. Computer, harness, evap gear, fuel system, oxygen sensors, catalyst. Then the fun of fitting the harness to a shell that wasn't designed for it. But, yeah, easy starts, OBDII, probably better on gas.
Looks like some of the Ratsun guys have carb'd the KAs and worked out which earlier distributors will work. Less to set up, less to go wrong.