Hi. Great news. Welcome to the snake pit

That gear will be fine. Don't worry too much about the kv etc just add a little timing boost and turbo and you'll be all good. Also don't bother with 4-pole. You should get around 6-7 minutes from the 5500. I'm assuming 2s on that electronics setup?

1/8th electric you need to consider the 977e - brilliant car!

Run at the track as much as you can. Once people see it they will want one too. That's what happened at my local track!