If you find an epoxy to plug the extra hole with, may as well use it to also bring back down the size of the original hole.
Symptoms from making the venturi too large is that the venturi will become weaker as you will have lowered the pressure differential. The venturi system is used to fill the fuel pump canister, and to transfer fuel across the tank from the driver side. A weaker venturi will do this slower, or not at all. The perceivable side effect would be the vehicle acting like it is out of fuel when it is not. Power cutting out, fuel starvation, etc.
Most G37s use almost the same fuel pump module, but its several inches shorter and not tall enough for the Z tank. You would have to hybrid it together and use your Z top hat and rods with the G37 lower half, or just take the venturi part you need and move it over.
Some G37s use a 350z fuel pump module, which would be entirely useless for you. So you will want to see a photo of the one you are buying first, and make sure it looks just like the one you have. The 350z module looks entirely different on the fuel tank side, so there would be no way to mistake them unless you only saw them from the very top (such as not removed from the tank) in which case they look nearly identical.
The venturi system is still used with a return fuel system, so you would still need to either repair or replace this component.
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