30-A Rider.For a carb they used a Holley 850 cfm double pump (part # hly 4780), and didnt say if is had vaccum or manual secondaries.
If it's a double pumper then it is a manual secondary carb. But according to the Summit catalog if it's a 4780 its a 800 CFM double pumper carb. Summit list the 4781 as a 850CFM double pumper.