68 barracuda 383 id numbers

Jim, but if it is a real early 68 the block casting date should give a tell-tail. At least a ball park of "correct" or far fetched, or not even in the game.
I don't think he's posted the car assy date to even consider if it would even be considered to be a real early 68 build.
I would imagine by the mid/end of Aug 67 this would have been added as it was the law of the land to do so for 68 model year.