Blow through on BBD carb?

This is on a /6.
Yeah, the Holley stuff is easier, but I have the BBD, this is a budget build, and I am pretty sure the Holley won't fit stock 2bbl intake. To my understanding most are using 2 bbl on 4 bbl intake since the 350 and 500 cfm are a better fit then bigger 4 bbls.