If you're determined to run dual carbs, you've got the smaller-sized venturis which will work better. Not well- - - -just better. I'd suggest plugging the stud holes in the manifold, and moving them inboard to get the spacing correct for the smaller carbs. It's a pretty simple procedure with some creative setup in a drill press and a set of taps.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!