what carb for 340

how many cfm do i want and how many inlets? 340ci 10.9/1 xe274 rpm air gap intake and headers 3.55 sure grip 4 speed. the cam and intake are good at 1500-6500. its a street car but built for higher rpm range. intake recommends 600-800cfm. summit calculator says 575- street and 700-race. my research looks like a 750cfm would be good. I'm planning on electric choke and vacuum sec.