many are now getting rusty, most cars are around 20 years old. Galvanising slows the process down, it does not eliminate it, so look especially around the boot floor, under the rear lights, rear wheel arches (they have plastic covers on that mask rust a treat), also around the front screen and sunroof.
After that decide 2.0, 2.5 or 3.0, twinny 2.0s handle better, 3.0s are fastest and 2.5s sound nicest.
Electrics can be problematic, but not impossible to solve, most do not have aircon, ABS, not an airbag in sight, from an age when a sunroof was a luxury.
Parts availability is good still, from EB spares and Highwood Alfa, nut do not expect dealer to know how to fix them, they rarely see them let alone work on them, and Alfa specialists do not see them that often either, so home spannering and joining alfaromeo75.co.uk is almost compulsory.