holley 2bbl

so i have a 1bbl holley 1946 on my 200 inline six. im going to go 2 bbl. i need the adapter for that space, and a 2bbl carb at 390 cfm. where can i find that exact adapter. and will the vacuum lines i have running to the 1bbl just fit right on the 2bbl i will get. im not sure what 2bbl will be...