I know this looks cheezy but I used a Moroso adjustable dual quad base with a couple of cheap Eddy air-cleaners. I had the Eddy Elite air cleaner but it would not fit under the hood.
I am going to try and fab the Moroso base into an OEM base and use a regular air filter. Haven't tried this yet and hope it will hide the fact that there are two carbs...tee hee...