The easy way is to build a box to put the carburetor in and pressurize the whole thing. Then the float chamber, venturi and everything see the same pressure. You'll need to make sure the carburetor has a foam float so it won't collapse and convert to an electric fuel pump with a rising rate fuel pressure regulator.
The slightly harder way is to use a bonnet and feed pressurized air to the carb throat. You'll need to make sure that the float chamber is only vented to the carburetor bonnet so that there is the same pressure on the fuel side as there is on the air side. You'll still need an electric pump and rising rate pressure regulator.
It's also a good idea to drill the throttle shaft bushings and add fittings to supply pressurized air to the throttle shafts in order to prevent fuel/air Mix being forced out.
