There was a post a while ago with a lenghty discussion about rostering. Try on advanced search for:
Gulf Air 320 Rostering!!!!
Scheduled 320 nightstops are done in:
Cochin, Bangalore, Muscat, Auh and Dubai (splendid hotel).
330
London, London, London.....J'Burg, Dublin, DeliDeli,CDG and so on....
As for which type, who knows, you might parachute on the 330 like so many others....
Good luck,
LNB