You should have a great time - if anything you will get impatient with the speed restrictions they start you out with, but it's generally for your own good so you gradually get a feel for what the car is capable of. Even if you have done track events in your own car, a 3500lb V8 stock car with race slicks on a banked oval is going to be quite a different (read: fun) experience.
And yeah, we need to go back to Altamont - if we go organized with 3 or 4 of us entering we'd take over that race.