Looks like a good project! As you probably know, the parts were all Campy Nuovo Record, with the exception of the Weinmann 610 centerpulls. Shouldn't be too hard to find the Weinmanns, since they were ubiquitous and inexpensive. You'll need the little barrel adjuster for the rear brake, which isn't as common as one might wish.

You might keep the rear derailleur if you plan to keep the TA triple crank. .. or find a nice SunTour VGT or Cyclone GT?

The Capella lugs are a curious detail for the International. They were used briefly, and I don't recall them being used on any other bike. Like the Raleigh "anniversary" headbadge that was on my '71 International, it's a fun detail that will make some folks say "what the **** is that?"

Steve in Peoria