Model B venturi Question

[PRG999]

I have 4 model B carburetors I have been taking apart and rebuilding.
They all have different venture sized openings.
They are marked:
1. .866 with a raised number 4 on the opposite side,
2. .866 with a raised number 3 on the opposite side
3. One marked 22,
4. One wide opened Venturi not marked.

I understand the larger openings were for the B Carb for the B engine and the smaller openings were for B Carbs on the A manifold and engine.
Which one would be the best venture for a A engine with a bored out A manifold?

Thanks
Paul