Check the inches from the intake to the place where the filters meets on both carbs. You can check amount of clearance from the stock air cleaner to the hood with some soft putty with the original carb first..
I've mounted a much higher WCFB to a stock air cleaner but had to sacrifice another air cleaner I bought off E-Bay for $50. You can do this too using a 7-8" diameter air filter and aftermarket base. Just takes a little enginuity and a jig saw...I can PM you on what I did but yours will be a little easier because I went from a 5+ inch diameter instead of the 7+ inch....Good Luck
56 Vic, B'Ville 200 MPH Club Member, So Cal.