I suspect the added blocks just richen up the mixture enough it will run on E85. It will take a lot of trial and error jetting to get the most out of it. Holleys are difficult to jet anyway.
When you go back to E10 and close the screw, it puts the carb back to where it was jetted for gas.
He better keep a close watch for gas leaks, especially with that Holley. It has internal and external diaphragms that are not going to be happy with the ethanol. Same for the fuel pump and the neoprene lines.
Don't expect the same performance or mileage, there is not the same energy in ethanol as gas. It's a trade off, so it's not like the price difference is all up front.
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