Nothing like having a big improvement at the end of the day. Just makes you feel so much better about the whole experience, not like when you bone the last couple and spend the next couple weeks stewing about it, like my probably-taking-it-too-seriously self has done.
Good job man!
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...