Word of mouth. Go to the track, or a chassis shop, or a car show and ask around.
Buying a running car is always a better deal than building. I would sell mine, but it's a roller and apart.
The drag racing season around here is basically done, I'm hoping to have my new heads up car ready to race by next year but I don't want to put her in that with no seat time in anything with a little bit of power, maybe later if she likes going quicker and can learn to drive safely and has good reaction times and so on