I believe it is real using two late 5.7 Hemi heads. That is what the discussion was with my son. It came up after seeing the viper heads being cut by steve. Valve cover looks to be made from early Fire Power covers. Steve said money can make anything. Some of these old guys that come here have very deep pockets.
Yall run down that rabbit hole all you want and I hope you come up with something....but that particular picture I posted above was proven a hoax and the creator of it even admitted so. Everyone who first sees it thinks it's real. It's not.