Having Bertones, they are not a 760, the 760 is a design follower, however many parts are the same. Definately the hood hinge from any 700. An 89 is a good year and had the Bosch 2.2H with Hall Sensor vs. the 90 2.4H with the crank position sensor. Starting in 87, they had the PRV V-6 with EFI, not the prior dogged V-6, and a solid axle like the 740s. In 88, they went to IRS and the Turbos. In 90, they added the turbo plus. Overseas, they had manual transmissions and also were shipped with turbo diesels. They are sweet rides and came with many gingerbread options, mud flaps, chrome wheel well trims, headliner fabrics, and interior two-tone colors.
My 87 is getting the clear coat flakes, normal for sun or no wax. Dash wood is different so do not try to refinish it until you know what it is.
Fuel problems generally are easy, FPR, relays, and then the harder filter and pressure pump, or in tank pump. Given the age, it is probably the latter.
Funky electrical issues are common with the other 700s, seats can do parasitic draws, other than that, no surprises.

The clearcoat may be able to be sanded away, clean up the paint that's left, and spray a new clearcoat.
What motor is it? Early ones had the V6, later ones had the T4, that year I'm not sure as it appears some had one and some had the other. In either case it's lh2.2 I believe, so not the same as your 940.
It will have the Nivomat rears, so finding good used 760 ones may be a good idea.
The later cars, at least the 91, had the 24 front sway. That could be swapped in.
Some have had rust under the side windows.
I have left side head and tail lights, and a grille btw. Oh and side trim.