I notice, the 650 is considered too small!! the fuel flow curve is where it's at.
in stock and super stock, they have to use the stock carb. they go very fast with "small" carbs!!!! the 69 340 cuda set the F/SA record, at 10.73,@ 120 MPH with a "small" AVS car. it's rated at 625 CFM. in super stock, the 283 chev has a 475 CFM rochester carb, the record is 128.11 MPH @ 10.20. they flog and tune , not change parts. just food for thought