Lower timing chain, always always replace. They wear, stretch, and you can't get to them once the engine's assembled. Yeah, at that mileage I'd presume to do all the wear parts as a matter of course. If the engine's been sitting, water pump is probably toast. Measure and inspect the crank, or if you're not qualified have someone do it. Probably needs grinding or at least polishing, but if it's OK as is, you don't want to cut needlessly. Flywheel, don't surface unless it needs it.
Head will need inspecting and probably some work. There are a lot of fiddly details specific to an Alfa (liner seating, e.g.), just like any engine. Having someone around who knows them can be a big help.