I’m no Marin knower, but do wonder if the 1990 Team Titanium ever had a cataogue build? It was Litespeed built no? And not cheap; if you were buying one in 1990 would you insist on a vanilla Shimano XT/ Araya build, or say to the distributor who only had a few frames “this is my dream bike, let’s go nuts!”
Which prompts the question, do you want the catalogue ‘spec’ to check a potential purchase, or to reproduce a catalogue build?
If the former, then there are probably better ways to check that the frame/ a prospective purchase is what it seems
Viz:
1990 Team TI.
If the latter, then I’d suggest going with what you want. Eg A litespeed frame and fork must be desirable, though something with a steel fork might be more useable. Add period boutique parts to taste, or XT and Araya to be a Steve McQueen “This old thing? Just a tool to do job” hero.