Hi Munir,
no, it isn't. A tuning company called "Weigel" has built such a car in the early 90s, based on a 3,6l V8 PT, having the same dimension as the ABH. Still, a lot of modifications are required, but the car was a monster (due to it's weight).
I have plenty of pictures from that kind of conversion, even an UR quattro with V8 engine. Don't forget that the Audi V8 was the most compact V8 engine of the world back in time!
Regards
Bastian
