If you collect bikes as art (and that's a perfectly reasonable thing to do), then you should collect as you like. Lots of folks like to collect period correct and specification correct bikes and that's just fine.

But if you ride, IMO, you should feel free to choose the best components for that frame where "best" is entirely based on what makes you happy and what adds to your riding experience. Personally, I view all top end bikes as frames with components hung on them and to be changed and swapped. I associate "original components" with lower end frames that sold as bike "models".