I never used to brush the chimney in my shop. I just let the occasional induced chimney fire clean it. Then I installed a 6" diameter 1/4" wall steel pipe for the chimney. I couldn't get it to ignite.
No it will not. Rebuild it or have it rebuilt but you need to make sure if someone else is rebuilding it that you get your transmission back. We've heard WAY too many stories of tranny shops swapping transmissions and then it not working.
You have a db2 if I read your signature right. Is it stock with stock turbo? If so you'll notice a big difference. Plus you'll need to make sure you're cooling system is top notch.