Is it worth buying Audi V8 3.6?

Hello I could get an Audi V8 from a friend, is technically something down anyway, technical flaws would be:
1. Chassis must be replaced
2.Tyres are worn (since chassis is sometimes worn). Other, of a kind used in the manufacture of beverages
3. Injection does not detect warm engine( goes a.d. Traffic lights off, moving unevenly)
4. Does not run properly on a cylinder (Zündkerze looks normal ??!)

Timing belt was changed before 50tsd km, so it would have been 50tsd to drive, UFOs are all still in good condition, there is a complete set (used), there is a complete 3.6 to slaughter, which is sometimes used. already disassembled.
Interior is really good in shot and climate etc. works, converter smells something funny??

I would get both cars for 1000 euros, drove yesterday, switched clean and runs well in cold condition.

What would you advise me to do or what else should I pay attention to?

Best regards
Flo