Hey Jeffro,
Great stuff there mate!! :woohoo: Well done. The other breather that you have circled is just for the diaphram to move up and down. on the original carby it went up under the tank to atmosphere. Nothing to worry about mate well done.
Cheers,
Lefty
Hopefully it is a little better on fuel than the old carby, let me know how you get on with it.
Cheers
Left 