What are stock 360 exhaust manifolds?

Hmm.. just by looking at the manifolds they appear as though the outlets kind of tuck inward toward the block. I should of gotten a picture of them but they are at the machine shop now, he isn't going to touch them until I give the say so. So let me get this straight, you guys are saying center dump manifolds are for truck and rear dumps are for cars? so these manifolds are no go on for my duster? I don't know if it makes any difference but on the outside of the manifolds they have some ribs cast on the outside that are horizontal, not sure if you can determine what they are by that.Thanks