The right 2 barrel carburetor for a Super six set-up

"The Holley 2280 was introduced as a bolt-on economy replacement for the BBD on 318s. Eventually Chrysler made it the factory carb for the 318 and the slant six. The 2280 has an airflow of around 250 CFM, and is a direct bolt-on for the BBD." you can read more about it here
http://www.slantsix.org/articles/supersix/article.htm