Hi!
Assuming there are no instances of those titleblock types in your model, you can just use Purge (under the Manage tab in your ribbon), unselect All, then only select the types you want to get rid of, then Purge.
If the types are not visible in the Purge dialog, right-click on them (one at a time) and select all instances in model, then replace and after you do that for all relevant types, try purging again and you should see them available.
Hope that helps!
Rene Pellicer Garcia
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