Thank you Milan for being the 1st person other than me to post of this Ljubicic board.
Unfortunately, I do not think I can help you out. Before your post I was not even aware that there used to be Orthodox Ljubicici in the Lika area. I am only familiar with the Ljubicic families from the Sinj, Imotski, Livno and Tomislavgrad areas. To my knowledge all these Ljubicici families are of the Roman Catholic faith.
Ljubicic is a common surname in Serbia so let's hope someone out there will be able to help you out soon.
Good luck and thanks for posting!
PS If you have any information about the history of the Orthodox Ljubicic families I would love to read about it.