I once bought a new 2002 Chevrolet Cavalier LS (not a sport model). It kept coming up as a Z24 at the insurance agency (the sportiest model). They didn't even make a Z24 that year. What happend was that when the car was built, they used a leftover 2.4 liter Z24 engine and the VIN# reflected it. I was fine with it, as it was an extra 10hp.
You got a blacked out engine in your Tbird?
or as a bad thought, was it a wrecked sport that was rebuilt with Tbird forks?
