BlackDoor provides two series, first series looks like iOS 4/5/6 and second series looks like iOS 7/8.

BlackDoor firmware supports only iPod touch 2G MB series, MC not. MC series have different Bootloader.
Where you find series your iPod touch 2G? "Settings -> General -> Info -> Model" and first two characters indicate series.

If you want look on list of features BlackDoor custom iOS firmware, click here.