Distributor rotation for 1987 Audi 4000 CS Quattro

[David Vanden]

Does anyone know or have a diagram of the distributor rotation for a 1987 Audi 4000 CS Quattro?  I don't know which cylinder plug wire connects to which location on the distributor.  I tried assembling it like the old one and it continues to hesitate and to back fire horribly.  Which is why I changed the plug wires in the first place.  The timing is still all off.  
Anyway if someone knows the arrangement please tell me.  Assuming I might have had it right the first time and it back fired anyway, does anyone know what the problem might be?  Electronic ignition?  Ignition Coil?
Finally, if anyone has an expansion tank in good shape for this car I would like to get it.  Let me know.
Dave