I would expect you would have to run the rotors backwards, but in their same relative orientation in the case.
Meaning turn the pulley and all the other way, that could be managed with the blower turned round and driven with a jackshaft.
Just a thought, I would think it easier to fab a plenum for the proper intake with the carb mounted on that, like the carbbed Buick T types, and the turboed air cooled VWs.
But that's me.