They don't know what the hell they're talking about. Those are not Hemi heads. They are though very rare, indeed. I actually never knew that a running example existed. Learn something new everyday.
What they are, is canted valve heads made for the small block Chevy, very similar to big Chevy heads. They only made a few pairs and as I said, I never knew a running example was out there.......but there it is.
That's pretty dang cool.
Speaking of small block Hemi heads, do you guys remember the small block Mopar Hemi heads that came out about 20 (might have been more) years ago. I thought it would be really cool to have a pair on the 340 Cuda, but they were SO expensive. Plus, I think you had to buy their Intake manifold.
"Supposedly" that setup is still available.