Gen 3 Hemi list input needed
I have to think it's the lack of demand.. All you ever hear is "LS Swap it" and fighting for a spot in what is already a pretty small pond, may just not be worth it to them.
I don't know that I've ever actually seen the Hooley headers and mounts installed in a pre 73 A body.. but then again, I haven't really looked. Google, don't fail me now!