What is the best sleeper to come from the factory?

This car is personally one of my favorite cars ever. I've been spending all day at school day dreaming about it. In 68' this was Dodge's compact car and this looked like all of the other dart GT's and GTS's with 340s and 383s but this one is special. Its the GSS, the GSS is basically the greatest sleepers ever. It was the only way to get the big block 440 under the hood of the compact car.

This got me thinking, whats the best sleeper to come from the factory ? I'm not talking about the guy who stuck a 2-Jz in his 240 wagon I'm talking a car that rolled out of the factory like that.