I know David too, and I know the quality of stuff he buys, and the circles he runs in, and I remember the research he did on that car when he bought it. It's the real deal, that gang lives and breathes CJ part numbers, paint daubs, assembly techniques, you name it.
I never knew about the tag though, that is odd.
The story is old though, it's been run hard down the strip quite a few times since those pictures and Blair built the current version of the engine