Thanks to all for the answers so far, another question would be the best place to find parts. Will I have any luck at the chain stores (AutoZone, Advanced, etc) or at the specialty foreign car parts suppliers? Or do I have to go online and order them? Specifically I think I should order a thermostat, fuel pressure regulator, maybe cap and rotor, anything else that is relatively inexpensive and reasonably easy to replace? Thanks!
Sourcing parts locally is difficult, so I've ordered stuff online (Centerline Alfa). I have had issues getting basic BMW parts at local chain retailers, so Alfa parts are a definite no-no. Body and interior parts are not always easy to find and tend to be expensive when they do come up for sale. Since this car is a hobby rather than a daily driver, the parts issue doesn't bother me as much as if it was my main source of transportation.
1991 Alfa Romeo 164S
2004 BMW E60 530i