In the automotive world, the definition of a clone is to convert it into something it wasn't from the factory. With regards to the first generation Camaro, it's done mostly to change a non-Z28 into a Z28, a non-Yenko into a Yenko, a non-SS into an SS, a non-ZL1 into a ZL1, a non-Z11 inito a Z11, etc... And cloning mostly refers to the engine itself (ie, Z28) but not always (ie, Z11).
And you'll NEVER see the reverse, such as converting a real Z28 into a base model, or a real ZL1 converted into a 6 cylinder coupe!!
Ed