Good luck on this one!
I also built that kit - I had all 4 good tires for the rims but decided to use another rims - they looked huge. I had fit problems with the hood, and the decals are terrible. Except from these, it was fun to build. I used the stock engine, and made my own stripes, exhaust tips etc.
Hit back how yours is going!
Here's mine, sorry for the bad quality:
