Yeah I have serious doubts about that carb design. I would be interested in the back story on the engine design. Peak power is 5900 RPM but the valvetrain and the oiling system appear to be NASCAR type stuff. 7/16 pushrods, Crower rocker arms. Peterson R4 pump, etc. Those are serious high dollar parts. Even the water pump uses a NASCAR style multigroove belt.
Maybe it is just designed to look like a NASCAR engine? Could be going into a vintage NASCAR chassis for track days or something.