I have heard of people turboing the Efi with aftermarket management ( the ford stuff won't cut it with boost as far as i am aware. Cossie management might cut it!!
With carbs it's rarely done unless the carb used was originally used for a turbo, as you get boost leakage above about 10 psi or so, and / or pressuring of the fuel and all sorts of running issues!
Thanks
Weeksy