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.