There are 747 NH classes on May 28 and June 18, both slated for 28 NH's each. 767 classes every three weeks throughout the summer.
No one in MIA TC has attended A-330 school. Check the FAA airman data base if you think otherwise.
It might be along time before 74 FO's upgrade on the 74 unless there is a new CBA. There are 81 767 CA's that are out of their seat locks and 30 more getting unlocked between now and the end of this year alone.