I have a ‘73 CB350G I’ve been slowly working on to eventually sell. Haven’t had any time since the fall to work on it though. Any of the 350 knowledge base would apply to the G model though since the main difference was the front disc brake. Just do a google search for whatever issues you have and include Hondatwins as a keyword and then if you can’t find an answer to your question post in the appropriate 350 section.
If you really want to check out a 350G thread then you can go here:
This was an extensive thread from a few years ago with some entertaining videos. I don’t know whatever happened to this guy once he spent all the time on his project though.