[alfa156]

Dear fiatosca.
I have owned a 74 Alfetta since 1975. Drove it hard every day for 25 years. Treated it to a spray can of fish oil. This stopped rust for about 10 years.While restoring (cutting out rust I would lead-wipe) the welds instead of using plastic filler). Rust around windows front and back. Needto remove glass as rustmay be anywhere. If it's a 74 the windows will be glued in. You need to poke through a wire (say a guitar string) wrap it around a piece of timber at both ends and se-saw it in a cutting motion all around the perimiter. THe glass will just fall out.
If it's a later model say 77 it will have the conventional rubber molds. Be very careful with front glass as it's laminated and relatively thin.Will break
Rust also occurs in the lower sills, between doors and front wheel (near the lower chrome strip). remove the panel inside the front guard (pop rivets) and a rubber plug at the rear.INside the wheel arch
If you look from the front you should see straight through with 3 water holes under the car. keep them clean. Stick a hose in there and clean out all the mud. Do not replace rear rubber plug and cut away the front panel to allow dirt to be hosed out later.
After all repairs rerust proof by painting with rust converter and fish oil.
Good luck