1968 Barracuda Formula S

I saw an ad in Upstate NY with a 1968 Barracuda Formula S for sale. The price was $8000, needs interior work and paint, fully running. My question has to do with the 340 motor, wikipedia.org indicates that the formula S in 1968 comes with a 383 v-8. The ad says that the numbers are matching. Is this fact or fiction?