Originally Posted by bodypainter

Well, I am positive that's no flathead. That's definitely a valve cover we're seeing and flatheads didn't have valves in the head.

Thinking about this morning I am convinced it's a Mopar Hemi with "Ford" on the valve covers. I don't see what else it could be. The position of the spark plugs indicates a hemi head so that means it can only be a Mopar Hemi, a Ford 427 SOHC, or a Boss 429. It's not the 427 and the 429 had very distinctive valve covers so that only leaves the Mopar.