My Pontiac 400 was used to replace the factory Pontiac 301. Kind of a street sleeper approach. Advertised as a 4.9 at show and gos. My other century has 462 Buick in it.It's always a tough vote with so many nice cars, and, even more importantly, LS FREE POWER!!!!!!
I also appreciate how many cars matched their powerplant marque to the car nameplate.
It was even harder this month because my favorite car didn't match my favorite engine. This being about the swap though, I voted for the engine.