carby supercharger works well been in plenty of them now
There is a professional installer of superchargers with
a mightyboy 660cc using an SU like for most of his customers
and there are no issues goes like stink day in day out.

carby turbo works if you know what your doing most dont follow through with a full dyno or have the time. Lots of little things like water/meth injection are not implemented and there are plenty of carb A series that have worked in the past. Not to mention there are tons of A series minis running all over the world with inferior cast iron heads doing it and doing it right.

The "runners to the inlet ports" are THE HARDEST to manufacture, make or produce from scratch, to weld a bit of pipe on the end of these to suit is plain jane easy and takes alot of the headaches out of the equation.

To tap some brass injector bosses is also easy facing the ports.

To make a dual downlet plenum just as easy once you have the flange.