So 300g/s @ 6000 rpm is 3.0 g/rev load. For the 2.0L 16bit ECU engines it reads double, just a difference in the way it is calculated, so it 300 g/s @ 6000 would show as 6.0 g/2revs.
There is no direct conversion to boost because load is not boost. It will depend on air temperature and volumetric efficiency.