The kitbash w/the Cutlass is an interesting idea. Not sure about engine, but the chassis/underhood stuff would be most valuable. The Revell interior would need to be used.
Any of the kits you show are basically the same as the other, the kits inside are the same for all intents and purposes, they usually just redo boxart. Those two Torinos are the same. The Revell Muscle is a new box.