I would bet the Shimano 600 stuff is probably original, but not the Campy. I bought a 1997 Classic for Mrs. Road Fan (matches the BikePedia listing), and it was Tigged, made of Columbus Brain, had full 8-speed Campy triple kit (excepting a TA Alize crankset), and clearly a sport-tour geo (pretty long chain stays). Our frame was built for Terry by Wilier. I saw US-made lugged ones in the Terry Forums which had a for-sale section, and they were mid and late '80s. Yours could date back that far. I don't recall any details about straight bars versus drop, though there were straight-bar models. Mrs. Road Fan's bike has the original drops, 3T stem, and Ergopower levers. I suspect your straight bars were add-ons.