see http://dev.bukkit.org/server-mods/otherdrops/#c1616
and the several comments above it.

Modded blocks are working for everything except when they are the target of an event/drop(even replacementblock paramater works with them)

Names for modded blocks shown by /od id are also not working only item IDs are.

I think it just because you need to put quotes around the target if it's an
id. I tried to avoid this need but couldn't come up with a nice solution.
Can you try it with quotes, eg "4400@0": and let me know how it goes?

Not sure if I can get the name of a modded block from the Bukkit API.