I am not sure about the changes in the directory structure but for the previous version I thought these would go into /design/hit/override/templates/node/view/full_class_1.tpl
Am I mistaken?
See
http://ez.no/developer/ez_publish_3/documentation/ez_publish_3/terminology_basics/custom_designs_directory_structure_explained
and http://ez.no/developer/ez_publish_3/documentation/ez_publish_3/terminology_basics/view_modes_of_objects
You could also turn on debug and see which templates are actually used (have a look at the how-tos in the user docs on how to see which templates are used)
The override system has been changed to support multiple overrides and a GUI for override creation. This means that you need to create new override settings if you would like to upgrade to 3.1 B1 ( don't do this for production sites ).
More info: http://ez.no/developer/ez_publish_3/forum/general/31_more_docs_needed_on_how_the_template_override_works