I still can't figure out how they managed to mix it up that badly. Was somebody hitting the bottle of whiskey that morning or???
I'm assuming they're talking about GT factors:
There's a 346/350/313 (was 305) and a 346/405/405 (was never 305 or 313).
Also, I looked at the 2004 Pontiac guide and I couldn't find a Firebird in there, as I expected. What's next, they'll hit the '88 Buick GNX with a few HP?