the idea of the box is the carb sits in it, and the turbo feeds into the box
that way its equal pressure inside and outside and the fuel ISNT forced out of the carb.
therefore no fire.
only way fuel can get out is for the pressure inside the carb to excede the pressure outside.
as for fuel pressure, raising rate regulator, keeping the fuel pressure higher than the boost pressure
so you will need to upgrade he fuel system to cope