I originally posted this in Classic & Vintage, but it might be better off here.

I recently acquired a 1989 Trek 660 with a mish-mash of Shimano components. I'll list the setup first and then ask the questions:

Front Wheel: Hub: Dura-Ace, Rim: MA-40

Rear Wheel: Hub: Shimano 600 FH-6400, Rim: Mavic Open Pro

Front Derailleur: Shimano 105 FD-5503

Rear Derailleur: Shimano XTR RD-M910

Cranks: Shimano Ultegra FC-6503 (triple)

Cassette: Shimano XTR CS-M900 (12-32, 8sp)

...So, I've been having problems getting it to shift properly. This is my first bike with SIS that hasn't been a complete gruppo. Will XTR on a roadbike work? Do these Frankensteined components somehow make sense to you on paper?