Check out the cutaway of a 235 head featured on another thread. Putting a fancy intake and exhaust and multiple carbs on a head that can't flow enough volume to make much power is "lipstick on a pig!. Good eye candy, but it's a losing bet.
http://s176.photobucket.com/user/curt160/media/848%20head/000_3183_zpsbb42b3bb.jpg.htmlI have a tendency to doubt the motives and the advertising claims of anyone who wants to solve all my problems by selling me something!
Jerry
Jerry - how do you know lipstick on a sow is not appealing to a boar hog?

However, as to the increases, I agree completely. An engine is a system. Removing one bottle-neck from the system with multiple bottle-necks simply changes the location of the main system bottle-neck.
Multiple carbs (when perfectly selected and synchronized) give a MODEST increase on an otherwise stock engine, not because of the increased air flow, but because of balance of the air/fuel mixture to all cylinders.
Jon.