Since you are researching the history of the Orange Bird character yourself, I will not go into that story here.. but about the LP, I can at least give you the cast, apart from Anita Bryant's narration. Robie Lester plays the Orange Bird, the evil cat, the mother, and the little sister.. plus miscellaneous bird voices. Sam Edwards is the father, and Ron Howard is the brother (it is obvious that he was hurting for acting jobs during this period).
The music was produced in London with the Mike Sammes Singers, and Sammes himself sings the cat's theme song.
Greg Ehrbar and I are in touch with Anita Bryant for the upcoming Disneyland Records history book, and she has fond memories of this LP.. and says to this day her grandchildren still enjoy listening to it.