it is possible to turbo a carby motor, i read about this kit the other day.

uses a rejetted weber 32/36 carby, a mitsubishi T004H turbo, and EFI fuel pump. comes as a bolt on kit (not for zooks) and has all manifolds made and inlet manifold ported etc etc. all bolts and nuts.

i have no idea on how it works or should work, but seems to look the part.