You know I guess it all depends - generally I'm of the preservation, restoration school but there are exceptions. One of the bikes I'd like to one day acquire is a late 80's - early 90's Bottecchia with an SLX or TSX frame. If I do get one of those bikes I plan to stash the original rear hub, derailleur, and brake levers (presumably C-Record) and replace them with later Record components to have Ergo levers and a 9-10 speed cassette. Not original but not too anachronistic either and it would make for a really nice almost modern road bike. With my 72 Bottecchia that just isn't practical. You couldn't use modern components without altering the character of the bike. Most people, even cyclists, wouldn't know the difference between C-Record or other later 80's Campy components and modern stuff (except for the carbon fiber stuff). But you couldn't hope to replace the old Nuovo Record gear with modern stuff without totally changing the bike unless you had mucho $$$ and your own machine shop and even then you couldn't get around the modern derailleur looking totally different.