Help w/340 carb selection

From what info I can find the stock carb Carter number (4425s)
flows 625 cfm. The Edelbrock 1405 or 1805 would bracket that with the 1405 flowing 600 cfm and the 1805 flowing 650 cfm. Now if I knew if the choke mechanism will connect to my existing set-up I could commit to something. As it is I`ll have to order the carb and won`t have the opportunity to see one first.