What were your compression test numbers? Were they zero, or just slightly down?
Did you reuse the gasket or install a new one? Did you spray the gasket? You said you didn't spray the block, but that's not something you normally do anyway. I see bits of copper spray on the block, and some on the valley-side of the head gasket. Is this from your last install, or left over that wasn't cleaned off while retrieving the nut?
The older Edelbrock heads weren't the best quality. I have a set that needed quite a bit of exhaust valve seat lapping right out of the box, not to mention all the aluminum porosity.
Could the clean cylinders be evidence of ingesting coolant instead of mis/non firing? That was my first thought.
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