I've never seen a real one but from what I understand, Mopar never got past the development mule cause Nascar outlawed them as soon as they heard about them. The Ford was a SOHC engine in response to the Hemi, which Nascar also outlawed. Nascar sure did take the fun out of the horse power wars! It would've been a cool engine, but what would it fit in? They added height to the heads and valve covers to make room for the cams, and it was a big engine to begin with!