Question about carbs for tunnel rams

When talking about carbs cfm isnt how much air a carb will flow but how restricted the carb is. Ultimately you want the carbs that will give you the desired vacuum level at full throttle for your application.

Put a 390 cfm 2bbl on a radical 540 engine, its gonna kill a lot of power but it will still suck the cfm it needs just at a higher vacuum level "restive" .

I'd go with two 500-650 ish carbs.