We're plumbing the depths of esoterica here but the shifters pictured are Victory friction, not retro friction. They existed at the catalogue from 1984-1986 and were functionally very similar to Super Record friction which preceded them for years.

Campagnolo did offer a braze on top mount shift lever boss, but the one pictured is not that - it looks like a bolt-on removeable mounting boss which in turn threaded into a brazed-on top tube mount.

None of this helps to date the frame, which I’d _guess_ at 1981-82 without further information. Maybe the frame was unbuilt for a few years, but otherwise I think it’s most likely to have had its original groupset removed for what’s there now. All Super Record, or much less frequently Ofmega Mistral/Modolo Kronos etc., often graced time trial bicycles of this era.