What’s required to make an N/A carb work on say a 671 blower?

Here is a quote from the article:
“Check out the captions below to see how simple it is to boost reference any 4150/4160-style carb. Note: this modification does not work for blow-through carburetors, only draw-through setups, in which the carburetor sits on top of a roots-style blower.”

I suppose the amount of boost would directly affect the need for the modification.