I'll say!
Actually I was looking at this engine trying to figure out how it could have hemi heads with the spark plugs in that location. I'm guessing those are wedges. If I had to guess I'd say that was an experiment using big block style stagered valves on a small block. Chevy tried it again in the 90's on some over the counter cylinder heads. They didn't work in NASCAR but were quite successful in open road racing.