"Out of these 370 almost 280 of them have dialogues in the movie, " said a source from the unit.
"Gangs Of Wasseypur" is a two-part film, and both parts will be screened at Cannes this year.
A thriller, it features actors like Jaideep Ahlawat, Manoj Bajpayee and Raima Sen, and narrates a tale set against the coal mafia in Dhanbad.