You can get "gaskets" or shims to stick on the back of the pads to help with squeal (Renaults use them a lot) but this is not a common fault with Alfas. I am not sure what types of calipers are fitted to the 3.2.
If they are single piston calipers it sounds like the pads are too tight in the caliper support/mounting. This can cause the pad to hit the disc at a slight angle causing squealing. As a rule of thumb, you should be able to slide the pads in and out by hand when the caliper is out of the way.
Not sure about twin piston calipers. Its a long time since I had a car with decent front calipers!
"When you sit in a Focus RS or a Golf R32 it’s like sitting in a commercial for Lynx aftershave. When you sit in an 147 GTA it’s like sitting in a Venetian’s hand-made suitcase." J.Clarkson 2003.
Current fleet: 156 Sportwagon jtd 16V (facelift) 2.4 Spider, Leon Cupra SC
Projects: Spider S4, Matra Murena 2.2