Knowing the manufacture date of your frame is a good place to start when selecting the proper components to complete the build
Just don't be surprised or offended when someone picks at the fact that you used Mavic 117 rims on a bike that was made in 1988, seeing as those rims didn't come out until 1994, and identifying and sourcing some period-correct rims would not have been that hard. Again, there is nothing technically wrong with it, but a little more effort would have gotten you a more period-correct build. This logic can be extended to all manner of components, tires, cables etc.
There are several categories one can work at when trying to be period-correct. I use the word category loosely and the number I chose doesn't mean there aren't intermediate 'catregories' or that there aren't a dozen more ways to slice things to suit your own needs. Also I'm not directly implying that C1 is better than C2 or on down the line. This is just my take on things based on what I've done and what I've seen others do with solid results.
Category 1 - A build utilizing only components that were listed or shown in a catalog, a replica of a team bike or something along those lines. Someone undertaking a build like this will make sure that everything down to the inner tubes is correct per the spec. All part date codes and stamps are aligned with the frame manufacture year and/or minor details like stickers or brake pads will be accounted for. A basic example would be using correct M900 coded XTR parts on bikes made from 1992-1994 and using M910 parts on bikes made in 1995. A more specific example could be only using Salsa stems with the correct decal for the given year of manufacture of the frame. Knowing which sidewall stickers on your Specialized Ground Control is key for a build like this.
Good example of a catalog spec bike (excuse the seat in this pic)
Good example of a faithful replica show bike
Good example of a non-catalog spec period correct build
Fair example of a Cat 3 bike (easy to cheat with frame that was built for over ten years)
There isn't much point in going down past Category 3 as at that point you're simply just throwing random parts on a bike and calling it vintage just because something is no longer made. In my mind that sort of defeats the points and frankly is just too easy.