#1...There's no mention of a 4160
Holley on the page you linked to. That is the carb in question here.
#2...The assertion that the Holley 4150 "is just too big" for the Boss and Shelby cars is complete sales b.s. in IMO.
Do the symtoms they list for the 4150 occur? Sure they do. But it's not
because the carb is too big. It's because the carb needs rebuilding or is not properly tuned.