Well the 392 or 413 were never offered in the Challenger, and the other engines have been out of production for decades (except the 318 and 360, but even they've been gone for a few years now), so that (thankfully) ain't gonna happen.

With all of the advancements in power and fuel economy that today's engines have... why in the HELL would you want some prehistoric dinosaur of an engine like a Slant 6 that can't get out of its own way in something like a new Challenger? There's a good reason as to why these engines aren't around today.

There's a such thing as being TOO nostalgic.