Any seen an AFB with an AVS top???

This obviously doesn't look right and not entirely sure that it's a problem but I bought a 1967 Commando code 4305s that is a California carburetor. My question is what makes it a California carb and would the emissions have something to do with it being this way? It's in excellent condition and was a good deal just figured poke some more brains about it.

Thanks,

Jake

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Is it an actual 4305 base?. If it is, then someone has drilled the extra mounting holes to use it on a newer manifold (wider "Holley" pattern).