OK.. just thought I'd put it out there, as long as you astute enough to take it all into account...... I've cheated my way around h.sets, that's another story.

Shimano was used as OE, many Team frames were sold also.
Though DuraAce was OE, the H.Sets were Campy. At the time, no others were worthy I believe. the Tange tubesets used on the Pros & teams were truely Euro dimensions. Unlike even the Hi-Mid range ones that used Tange sets ( even the 912s, and other JPN. built hi-enders) REMEMBER yours IS an '84 NOT later. In 1984 things hadn't quite been sorted-out yet. Just after, ISO & other stuff was more clearly defined, it's a language thing sort of. The Tange tubeset on your bike was unique.