In attack it would look like this:
Cassano would team up with Vieri in attack, while Totti would stay behind as a playmaker, but making runs into the box when possible. Pirlo would move up from centre defence to playmaker (they would have two playmakers then, Totti and Pirlo), but unlike Totti, he would at all times stay outside the box, ready to defend if the opponents start a conterattack. Zambrotta and Fiore would be typical wingers, breaking through the flanks and crossing in for Vieri and Cassano. Totti and Pirlo could help them, drift a bit to the sides and play a nice one-two combination to put them through and give them a bit of space. Rino Gatusso would stay in centre midfield, protecting the defense while he would be helped out from Nesta who would be a bit behind him, between him and the back two, who would be Bonera and Cannavaro.
This tactic would be a bit voulnerable to counter attacks from the sides, as there are no right and left backs while Italy is attacking, and the key would be fast transition from attack to defence, the players need to know their place on the field.