You have a start. That muffler doesn't belong but the air filter is proper. Just give the carrier a good clean out when you get it and (DO NOT)
throw any thing out until you are finished with the restoration. Good luck.
P.S. What you should do when you get it is tow it around a field or somewhere for a bit, just to loosen up the track somewhat. It makes it a hell of a lot easier to work on and to replace them when they are a bit pliable. This is an Ontario carrier so I have a lot of experience when it comes to anything rusty.