This is one of the many reasons that I like MOPARS. Having the smallest budget of the big 3, they sure did some interesting things! These parts are way cool!
I'v seen them at swapmeets for 2 grand firm and thats without the linkage!
My dad used to have the whole setup with intake, headers, cam, linkage,and carb he sold the whole thing at a swapmeet for 700 bucks in the early 80's.