as best i can recall all audi 80 sports where 4 pot. (we are talking about the old style audi 80 that looks a bit like a mk2 golf?)
if your engine is an AAD code then that is the code of your engine. A 9A is another 2.0 ltr engine like a 2E or an AGG.
your engine was fitted in the audi 80 between 1990 - 1991.
if you swap bottom ends over the engine will drop straight in

use the 2 ltr bottom end head gasket and plonk your PB head on top. not sure if your PB dizzy will fit the audi block tho. try the audi dizzy first tho i think it should be ok.
with regards to the cam i would get the bottom end fitted and get the engine set up and running hunky dory as you will proberly need to play with the timming. once its all set up then get your self a piper or kent cam with a vernier pully so that you can get the timming spot on.

and enjoy
