Thanks for all your replies everyone, I will consider everyones advice. Also I thought it would be interesting to show my Fox here and what it needs.
As you can see the front chassis is cracked, it actuly happend recently when I picked it upby the front end

The bottom of the bumper is also a little cracked but should not be an issue for a runner. I also did a stupid thing a long time ago and cut the top part of the chassis in half to gain easier access when sharing serfos and esc. I used to run a Futabba MC112B in it. But now it has the original inside of it and still works. Just missing the original motor, it could probably also need new resistors. But other then that and a good cleaning it should be good, plus get a new shell. The one there is called the sly one, I think it was a direct replacement for the Fox, I saw a fox with it in the original tamiya video. SO I guess if I were to part with the Falcon, I would hope to get a fox one, but I know they are hard to find. I can always epoxy the current chassis to let her run again while I look out for a new chassis.
But above all I first need to get a new battery and charger for a runner that is compatible with the tamiya plug and compaitble with a Novak T1-X vintage white plug any ideas? Thanks again everyone and here is my Fox. They were bought at the same time. The Falcon was my brothers but he lost his interest in cars and gave it to me back in the day.
