I have just bought a 1991 3.6 V8 quattro. It has some problems that I am sure you all know:

1) PS/brake pump is leaking.
2) Automatic trans is slow to engage - about 20 seconds when cold.
3) There is a REALLY bad smell when ventilation fan comes on - lasts about 3 minutes.
4) Also, it feels like the diff is always locked (as on old type quattros). Quite bad in tight corners.

What is the best way to fix these problems - your help will be well appreciated.