Nah, the top classes (TF and FC) use a system that can't really be described as EFI nor carbureted. Yes, it's a roots blower. It's also a bunch of fuel injectors in the hat, in the intake manifold, and directly into the cylinders... all driven by a 95GPM fuel pump. When you see white mist come out of a header part way down the run, it's because that cylinder has "gone out" and it is spraying the fuel straight through and out the pipe. Either the spark plugs flooded or burned right up. They are fascinating pieces of engineering, but pretty much completely have nothing in common with the cars you and I drive.