It is my sad duty to report that it will take more than a serial number alone to identify your canoe. There are no Old Town or Carleton records for serial number 3067. Kennebec used this number on a 16 foot canoe so that isn't a good match since you probably have a 20 foot canoe. Pictures showing the bow deck, seats, thwarts, and stem profile would be a good place to start. There have been hundreds of canoe builders in Maine and we don't have records for most of them. Sorry,
Benson