Hi Chuck,
Version 3 would as Roger has already said be more likely draw air instead of fuel. Version 2 is Edgar T Westbury's design for his Seagull, Seal etc engines, it works but the size of the hole in reality needs to be quite a bit smaller than as he originally designed. When I did my Carburettor experiments with the Seagull engine I found the size of the orifice required was 25% of the original hole used by ETW. This worked out at about 0.008" (0.2 mm) diameter.
Version 1 would I imagine tend to improve the fuel mixing, a lot depends on the offset but with a lot of these ideas the only way really is to try them back to back.
My best regards
Gray,