My apologies to everyone, seems I need to start reading with a magnifying glass.

There was quite a list of applications.
But reading the fine print, I find that the manifolds were designed for three Holley 500 CFM 2-barrels EXCEPT for the Chevy 6's which were drilled for single barrel carbs.
Makes a LOT more sense!
I guess no one has tried this, or they would have corrected my initial post.
For those who like eye candy that actually works; this manifold with APPROPRIATE single barrel carbs should work well.
Again, my apologies for starting the thread with incorrect information in the first place.
Jon