My 75 Finally Gets The Attention It Deserves(This Could Take a While)
Looking at another engine bay of a ‘75 318 Scamp, which is low mileage, it also has the ribbed passenger side exhaust manifold. This is from @Woody’sScamp garage profile.
Tanker, unless another member has definitive proof that a ‘75 manifold should be the same as a ‘74 318 (not ribbed) I think you’ve got the right manifold.