Hello
If you look in this forum you will find a thread just for the TC3.
If I was you I would not bother sinking a bunch of money in your TC3 before you race it. There is a chance that you can use your current motor if you race with beginners. Check with the organizers.
I would spend my money on tires (the ones that work at your track)and battery packs to start with. (for racing and practice)
See if you like it and if you become good at it start spending ...
I think your TC3 is good enough to be raced the way it is.
Practice....Practice.....Practice and have a blast....