My advice: Taking the carburetors apart is not preventive maintenance procedure. Don't do it!
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+1 on that. But as stated, in case you insist on doing so, make use of the camera. As for those springs at various places in the ass'y., they have a tendency to come loose unexpectedly and fly across the room, at which point they enter another dimension...never to be seen again. If the rails aren't leaking, I'm not sure I'd mess with it. That old saying of "if it ain't broke, don't fix it" applies here. The sequel to that is "if we can't fix it, we can fix it so nobody else can either."