I think it really needs a tune because it stinks of petrol and I timed its 0-60 n it was 11.5 seconds It should be like 8 or 9 seconds shouldn't it.
In a perfect world with a perfect 33. I lose about 3 seconds shifting from first to second gear, because otherwise I'd overpower what's left of the synchromesh!
Are your air filters sitting directly ontop of your carbs or is there some form of velocity stack (?) between the carb and the filter? I think this has a significant effect on the power and torque output of your engine - different length intakes work best at different rpm etc.
You should find some independent Alfa specialist and see if they can get your car going a bit better.