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From what you have told us I wouldn't consider it a parts car. In the hands of someone who could do the work themselves it is a repairable car that could be saved by spending just a little money. I would agree that it doesn't make sense to have a mechanic spend a ton of money on it that you will never recoup by selling the car. Reattas can be a reliable car but I usually tell people that if they can't do the work themselves it might not be the right car for them.

Because the 91 L27 changed the whole oil filter mount.

No. Reatta (and GM from 1981 to 1994) use an "Assembly Line Data Link" (ALDL) which is NOT OBD-II. Moates.net has what you need. For a hand held I like the OTC 2000 with a '93 Pathfinder cart. There is other stuff if you want to reprogram ( see http://www.tunercat.com ) but for all scanner operations the indash scanner in both Reattas and Allantes is just as good and can clear codes.