Thanks for the advice, thought I'd post some pictures of what I've done to the bike and some of the decisions I made.
I still need new wheels but the old ones still look OK after 20 years. The paint is nice and bright now and I've cleaned and overhauled a few of the old components.
I decided to keep the obsolete 8 speed Campy derailleur because I like its sculpted looks:
Since I might get Shimano-based hubs when I buy new wheels, I went with Silver friction shifters mounted on the quill stem which I got through Rivendell. This will give me a wider choice of cassettes, over the 3 expensive and hard to get 8-speed Campy cassettes available.
I like the way this has simplified the cabling! I also kept the old center-pull cantilever brakes:
I bought a new Brooks saddle which I will have to ride a lot to break-in :