Bill, do you have specific knowledge of how to tune carburetors for blow through supercharged applications? These guys do, http://www.theturboforums.com/smf/index.php?board=13.0 The reason I ask is, it seems you may be disseminating false information based on prejudice or misinformation. What you seem to be stating is a carburetor only works at a specific atmospheric pressure and to change that pressure, the fuel delivery would not change. If this is what you are stating, then you are incorrect. Most carburetors work on pressure differential by means of the venturi effect to regulate fuel mixing and this happens on airspeed over the venturi creating a low pressure area and pressure on the fuel supply (float bowl) relative high pressure. Tlowe described in basic terms what I understand from reading and talking with people that have actually done this. It works extremely well, so much so that I really don't understand why the negative connotations about blow through. But if you have specifics on how and why your statement is true, please continue to educate and inform.