That is pretty impressive, and yes, it is certainly a sleeper. It reminds me of a guy I worked with in the early sixties who had a 1939 GMC pickup that was "patinaed", to use a more modern word, the fenders shook and sort of flopped a bit, and it would shut down almost anything on the road - he ran a few different engines in it, but Caddilacs and big Oldsmobiles were his favorites.