Well my experience is stay Far away from them
it took me 32 hrs to get them to the point where the engine would turn over after I got them , there is a detailed account in the Proven engine section
Eddy did half of the engineering to fit them & then stopped , I had troble getting the correct rocker arms as they were designed around an obsolete Mopar Performance rocker arm , then had to relocate all the pushrod holes as they were not even remotely close to be positioned correctly .
I have no idea if Eddy has corrected any of the blatant errors or not