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I'm not sure what you mean by "lazy advice".
Your idea of "a little research" may be poring over low resolution catalogue scans (which were never intended to demonstrate the differences between components), but it's not mine!
A bike manufacturer's catalogue will show individual components in even less detail.
Velobase hosts user generated content, ie it's only as good as the people who contribute to it. It can be useful for additional information, but it's certainly not a reliable primary source.
Scilly.Suffolk
I think that's some lazy advice to be honest, to stick to past 1995 campag bits because they have a name on'm. There were some cross overs of parts between groupsets, sure, but with a little research you'll be able to tell it all apart pretty easily. There's enough reference material out there, yearly Campag catalogues are easily found. Also looking at say a Pinarello catalogue from that era will give you a good idea of what parts should go together. Velobase.com is a pretty reliable source too.
As for the groupset on the Marcarini, it's a mish mash of components from differing groupsets and even brands (brakes are Mavic). It has cast Aluminium ergopower chassis (shiny finish and less bulky), which indicates they're early versions, 1992 to 1993, before those became a plastic. Looking at the tip of the lever blades, they're pointy and don't have the blunt tip typical for the very first (1992) Ergopower levers. This puts the levers in 1993. Chorus and Record shared the same ergopower design that year.
1993 campag catalogue http://www.retrobike.co.uk/gallery2/v/Manufacturer+Archive/Campagnolo+Archive/Campagnolo+Catalogues/1993+Campagnolo+Catalog.pdf.html