340 Engine Shake

Eh. I think that is up to the buyer. Me,.I wouldn't and still don't have to have the 340. The only reason I do have it is because I found the entire motor for $300, back when I first got the car. I wasnt seeking one.

Truthfully, I'd rather sell it to someone who has to have a 340.

Two things:
1) 340s are rare and come at a price premium. So it will always be worth more with a 340.

2) People with only a passing knowledge of Mopars will always think a 340 is better, or more special than a 360 in some mythical way that can't be replicated by anything but a 340.

I'm with you in that a 360 is no drawback, and can make "just as much" as a 340 with the proper build. Just pointing out that if value factors into your calculus, saving the 340 makes good sense. But if you're gonna ride or die with this car, do whatever makes the most sense for you.