I can see where an OEM would prefer to keep the induction system as simple as possible (AKA single carb) for a car that will be a passenger car. The dual inline 4 bbl carbs are just so cool and scream Hot Rodding though. Its interesting that Ford was the first to use the 3 Holley 2 bbl carbs on the 406- then a variation of those carbs used by Chevy on their 427 and finally Mopar on their 1969 440 B bodies. In the 1970s movie Hot Rod the main character is speaking to a babe. He says something like: " If you blow up it up rebuild it with dual quads. If you blow it up again put a blower on it." Such great advice!