Issues #314-325 have new stories taking place concurrently with Legion of Super-Heroes (1984 series) #1-12.
Issues #326-342 reprint Legion of Super-Heroes (DC, 1984 series) #1-17.
Issue #343 reprints stories from Superboy (DC, 1949 series) #195 and 201.
Issues #344-354 reprint Legion of Super-Heroes (DC, 1984 series) #19-29.
Indicia titles:
#314-331: TALES OF THE LEGION
#332-354: TALES OF THE LEGION OF SUPER-HEROES
Cover title for all issues is TALES OF THE LEGION OF SUPER-HEROES