EFI for slants with this set up?

Six motorcycle carbs on a IR style of manifold have been used on the \6 multiple times. With good results. I don't see why a similar set up for EFI won't work either.
one carb per cylinder has been used on multi cylinder motorcycle engines for about forever. With excellent: idle, throttle response, torque and hp. Why would it be less successful on an automotive engine. Fuel injection would make for even more precise tuning.