I've debated these issues in the past. Hemi was and has become such a buzz word these days that is does get misapplied.
Even the modern "Hemi" advertized in trucks and such has what I call a "roof-top" combustion chamber. From my perspective, if you can take something round, like a ball and a combustion chamber follows the shape, that is what I consider a Hemi.
It also seems the valve arrangement should be opposed, rather than side by side to be considered a Hemi.
Don't get me wrong, I'm a big fan of these "porcupine heads" and was just speaking with Charley about the Yellow one he owned in the 1990's. That car made a huge impression on me then and is one of the reasons I am such a fan of multile carburetion.
I eagerly look forward to your build.
