MX-6 V6 newcomer, questions about maintenance, special features and everything else

Servus, I bought a MX-6 V6 to build it as a race track toy. I don’t want to discuss here whether it’s the right car for it or anything else. It’s simply about expanding my knowledge of the car. The car needs a big inspection of why I would be interested, for example, if there are differences between the 120,121&123kw variant. It’s done, engine oil, tooth & belt, oil / fuel & air filter, WaPu, tension rollers, spark plugs, brake Is there an activated carbon filter and has to be replaced ? Is there anything to consider about the things ? Whether it is teeth number of the timing belt or year of construction / engine number dependencies or something ? Do I need for the exchange of any special tool or do I have to take special care somewhere ? Before the questions arise, the car gets another brake system (fixed caliper), exhaust system (from engine), chassis (thread), shell seats, suspender belts etc just the full program. Ol Aside from rust and the climate that doesn’t work, the car still has a flaw. The switchstock has no centering anymore. Speak the part just bambs around. Whether neutral or gear inserted feels exactly the same. Something has turned out there. It can be turned clean but the switchstock has far too much game. I don’t know the best description but maybe one knows the problem. Greeting Sebastian