I am building a mid engined car and looking for an engine transaxle combination.
And what "orientation" will the engine be placed?
I have not been able to pick up a late mode manual A4 engine and gear box, but there are a number gold engines available. I had heard that the golf and the A4 have the same motor.
Audi and VW may use the same basic engine blocks and so on, but they will have different clutches, different engine mounts, and different bell housings - which are purely dependent on weather they are to be transversely or longitudinally mounted.
So if you have an engine from a current Mk5 Golf, then the only Audi transaxles which will be compatible will be from the current shape Audi A3. I'd very much doubt that you could cross mate transverse and longitudinal components, without some serious customised fabrications. Though I could be wrong!
