I'm rebuilding my Zenith carb and a couple sources on the web (including one from our host) recommend sealing an extra port in the base by inserting a piece of o-ring. I followed the instructions but when assemblying the halves, I realized that the holes on my carb don't seem to match the ones in the article - so I appear to have plugged the wrong one. Also, it looks like there might be another extra hole that the gasket only partially covers, so I'm wondering if I should plug that one too.

So my questions are:
1. Should I swap the holes our host recommends blocking (leave open the one they block and block the other)? Maybe my carb is a different model?
2. Should I block the other hole not discussed in RN's article and which the gasket doesn't fully cover?

Hopefully the attached photos explain this better. Here's a link to the RN article.
Click image for larger version. 

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