Another 2 into 1 means a different approach which should give good results, and for far less $$ than aftermarket setups out there and totally custom. Just need a builder's kit from Biltwell and a collector from Cone Engineering and I'm in business.
I make these to fit your original CV, or S&S Super E/G, Super B, Bendix, Mikuni and SU carbs. They measure 5 1/4 diameter x 3/1/8 total height and includes a 5" custom-sized K&N for your filtering pleasure. Mikuni & SU requires adapter bracket ($40). Please specify which style you want when ordering. See store for ordering info, or hit me up at firstname.lastname@example.org