A lot of people are into the 340 just because of the nostalgia and ability to tell others they have a 340.
If I had one I would sell it.
Same with a Hemi.
Now I have to say you are a smart man...I say to the wife all the time "if I was smart I'd just unload everything now and keep My Harleys...:)
But there's more to it than that have ya ever ran one or opened one up to rebuild it? Its really a testament to the Chrysler engineers and what they could come up with and no it isn't a warmed up 318 that's what people don't understand or refuse to believe. The sound of one idling is unique like how an 80s 5.0 Mustang GT is. Now I will say yes you can get a 318 "sounding good" with a cam but it won't rev... its in the heads. The powerband of the two engines is completely different.