As a general rule, all of the reserved seats do not fill up although the ones in the prime locations normally do.

If you're planning to arrive at 7:30, that should be early enough to avoid any long lines since final eliminatons don't start till 11. You'll have plenty of time to walk through the pits, the midway, or the special 60th anniversary display which should feature a lot of cool cars.

Also, you might want to check around for ticket discount. I know that Auto Club members get a deal and there are usually coupons at places like O'Reilly Auto Parts. You can also call 800 884 NHRA and ask where to find the best deal.