Buy a used race car. You will spend at most 25 cents on the dollar vs building a car. And don't worry, there will be plenty of things to do on your "new" used racecar. I also suggest buying a car as it comes off the track if you can. Look for a car with lots of "good" spares. You will need spare rims, engine and transmission. IT requires stock brakes. Your datsun 210 has not been made for many years. Spare parts could become an issue. Nissan has also stopped supporting hobby racers. Welcome to our addiction. The advice to go and help out at the track is also good advice. If I had taken the time to look more into racing, I would be racing a formula vee now. I did not know a sole when I got into racing, and the internet had not been invented. I bought a VW scirocco out of someone's driveway and spent $5000 to get it to my first school. Don't forget, you need a fire system, belts, racing seat, and helmet.