Well there is nascar its self which would probably the best of them all. BUt the teams (big names) Hendrick, RCR (Richard Childress Racing), DEI (Dale Earnheart INC), Rousch, Yates, Wood Brothers just to name some of the big ones. You can go to the national registry on the internet look up some of the names and get some email addy's of the cheif pilots.
I know NASCAR has hired low time guys outa riddle before but they want guys who will stay for a while not just build time. Most corp.s know you are a stable pilot especially if you've been a "working pilot" before. In the interview they wanna see you say yes sir and that youll be their employee and they like you and can be a good representative of their company.