The frameset is a 1984 Bianchi Limited, Superset means it has a heavier gauge down tube and chainstays. In this case, those tubes would be Ishiwata 024, not a bad idea given the size of the frame.
I have the same reservations, regarding the conversion as roccobike. Heed his advice. Ride it. Remove and install the rear wheel. Look the stays over very closely for signs of rippled metal and cracked or chipped paint . Both will occur in the area of the bridges, which may also separate from the stays.
From what I understand, SoCal is a very expensive market. Dura Ace 10 is also not cheap. I think it's a better deal than most other members, provided the frame wasn't damaged during the cold setting.