EFI essentially eliminates the need/effectiveness of fifth cycle scavenging during the overlap, since the fuel is pressurized (rather than drawn) the injector can deliver the fuel (as well or better )later in the induction opening cycle, that also gives you more room for Air (read:Oxygen) to get in the hole and still get the fuel in before the slug turns around at BDC and the compression cycle starts.

Bottom line is when you spread the lobe centers and (generally) delay the ICL the torque curve broadens and particularly part throttle drivability increases compared to a carb. But at WOT it's tough to significantly top a well-tuned Holley when using a conventional single carb/EFI TB intake induction system. You basically tune the cam timing to enhance part throttle drivability. Direct Port injection is usually a different animal though. Those have the advantage of the runner building AIR velocity and don't have to worry about suspending emulsified fuel with it most of the way.