Hi and welcome !
There are a number of differences between the supercharged engine and the standard one.
Most significant is the different compression ratio - you'd need to find a way to do this on the standard engine too. It's not impossible but it makes it a bit more of a challenge. Other problems would be finding the correct inlet manifold, carb and supercharger.
It would probably be cheaper to go down the standard tuning route of twin webers, ported head and exhaust - It's relatively simple to get 140-150 bhp that way which is more than the supercharged engine makes.
What sort of Beta is it ? Pics?