1968 Barracuda Formula S 383/4 speed

Aloha
My new project a Numbers matching 1968 Formula S 383 / 4 speed . 3.91 / b5 blue . split bench, no console / heater delete. Car is in pieces, hoping to find out how rare ? If worth putting 15 to 20 thou to restore it. Some body and trim pieces missing but #'s matching motor & trans has been rebuilt and ready to go. What's your thoughts ??? How many out there ? Rare ?