If there's anything questionable from the previous owner, really look out. You're in for a many many month restoration and sinking thousands of dollars and hours into fixing all the problems. Here's why; a lot of the suspension and driveline components are dampened with rubber bushings and couplings, these will wear out first with distance driven, and then age (ten years) .
Cooling system has many rubber orings which dry out with age and will fail when loaded to specification. Not to mention hoses.
Many rubber oil and vacuum lines will get brittle and break with age (ten year). A lot of these require the intake manifold to be removed to fully replace it. While youre in there, a lot of work can be done.
Oil leaks and coolant leaks take a long time to eliminate due to age and wear of sealing surfaces, coming from multiple points.

Here's something to realize with incompetent mechanics and vehicle owners:
not completing work to factory specifications and not following procedures. replacing parts instead of troubleshooting correctly to find problems. electrical by-passes as solutions to problems. incorrectly torqued fasteners. rounded fasteners. stripped threaded bores. 'short cut' work that will be determined once you take something apart, there will be revealed more problems.

very carefully have your current vehicle completely inspected by a competent mechanic (very good luck trying to get one) . I would say these are important: engine compression check. number and locations of oil leaks. coolant system pressure tests to specification - while the engine is idling. engine oil sample analysis. transmission oil sample analysis. differential oil sample analysis. coolant system sample analysis.
careful inspection on a lift to determine the condition of all the rubber mounts and driveline couplers.

then, decide based on how much you paid for it, and how much the work to bring it to a reasonable standard will cost. is it worth keeping, is it something you feel safe to drive ?

some thoughts, based on what i've been through. previous owners who are irresponsible and can't afford to maintain an european vehicle, trying to 'brand flex' and show-off are some of the biggest obstacles to us.

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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.