Curve #1, the Bosch 045 should be good for you. It was was used for European 2L motors and it is a good all round curve.
I have talked to several people who have found that Alfa's run best with the most advance at mid range then falling back a little at higher rpm. The 123tune allows you to do that but how much do you use? You will need plenty of dyno time or someone who has done it to share the knowledge. Maybe the guys in this thread had that information.You might find this thread from a couple of years ago interesting.