If you are going to be a bear, why not be a grizzly? I'd stroke that Hemi, get a minor port job on the heads, 3/4 roller cam, 10.5:1 compression.
Look, the 425-460 horse of a stock Hemi was a big deal in 1966-1967. Today, it's nothing. Don't embarrass the Hemi legend by building an engine that won't keep up with the LS.
The factor of embarrassment is based on the stroke?
If so I'll put 10k up against this car heads up no matter what displacement it ends up at.