Replacing chest blocks with, for example, data value 0 in mcedit replaces chests with all data types, so that wouldn't work.
All chest with data value 0 in my world are dungeon chests, so removing and replacing all those chests just takes to long if I have to locate all of them.
Replacing chest blocks with, for example, data value 0 in mcedit replaces chests with all data types, so that wouldn't work.