Check out the engines here:
http://www.supersixmotorsports.com/

 

What a horrible idea. Are you aware of the weight of a 454? You can do it, but hey, with enough money you can put a jet engine in there, but that doesn't make it a good idea. With your current level of knowledge get a newer stock engine, that's gonna be about enough for you, engine swaps aren't a beginner mod, they are rather advanced, even if it's something as simple as swapping out an old v6 for a newer one.

Ryan