Hey Poguemahone - welcome back stranger!
Originality enhances collectability and in some instances your enjoyment of the bike. There is a school of thought that for many bikes (especially those that would have been sold as frames), fitting the bike out with nice, appropriate-era components is as good as being anal about getting the gruppo exactly "right".
I like the idea of keeping original parts for show, and an alternate set for riding.
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In search of what to search for.