Yes Roger and Djape you are right
![Undecided](http://131mirafiori.com/smf/Smileys/default/undecided.gif)
On closer look at the pictures the engine just looks thrown in there. So it might not even have ever been fitted to that car. There's no gearbox attached to the engine but there's a Sport type gearstick still in the car.
Mike, I remember discussions for 4WD 131s and I remember seeing photos of this car before but I can't remember where. As Stathe has said, it's been done before. There's a guy in Italy who sells Delta based independent rear suspension for the 131.