I would expect it to be somewhere in the region of 200 bhp.
Its 146 bhp now as it is (137bhp engine with chipped ECU which gives another 9bhp). After I install the supercharger, I would expect at least another 50 bhp out of it.
Power is not the real issue here though. I expect the car to be very very light, considering that I removed all the glass of the car and replaced with plexiglass, no seats, no interior, the insides of the doors will be chopped off as well, no bumpers etc etc.
Definetely RWD. I learned driving with my father's Giulia 1300Ti and had to switch to a BMW 25 years later to get a RWD again. Don't forget that Alfas switched to FWD with the introduction of 155 after FIAT's wrong in my opinion decision (was based to the Fiat Tempra)
Alfasud is excluded as is classified as a small hatchback.