If you want a badge on your car ( and if it legitimately has a 340) do it! Most won't know or care if it's "right" and if they do, and don't like it, f#@k em. My friend with the A66 had a R/T butt stripe on it when she bought it. It's NOT an R/T, but she liked it and had the stripe put back on when she had it painted.
Bottom line, she now refuses to "show" her car, cause she got grief over the stripe. In my opinion, not showing it doesn't hurt her any, but deprives other Mopar people from seeing a nice, fairly rare mopar.