It has a Campy headset which he believes is original. The BB is one he bought and doesn't recall any issues finding one to fit. Has Bianchi or a B in various places etched/stamped/pantographed into the metal. Has a rear hanger. Not sure what make the dropouts are but the rear are forged. Seatpost was set in deep with no saddle on the bike, eyeball guess would be close to the diameter on my Centurian or Colnago, bigger than the older Schwinns at least, and I suspect it's a fluted seatpost. There was at least one set of water bottle brazeons. I don't recall what the cable routing or stops were like.
I'll have to wait for the rest of the answers until I see it again, possibly Friday.