Hey. Thats great! We are going to Road Atlanta next month too!
We drove a big heavy Crown Vic for 24 hours at Carolina Motorsports Park. It was our first race. We went full 24 hours noon to noon. We went through 8 tires.
With your car, it would be unlikely that you would need more than 6 for 14 hours. But luck favors the prepared. If you bring 8, you will definitely have enough tires.
What will most likely happen is on Saturday you will burn through 2 of your tires on one axle, (on our car it was the front,) and the other pair will look fairly undamaged. After Saturday's race you will replace the two worst tires with the two brand new tires. 6 should be plenty. Our answer is 6 mounted tires for your car at Atlanta, on a 14 hour race.
But it is highly unlikely you will need 8.
Another strong possibility is Saturday night all 4 will look ok and you simply rotate the fronts to the back. This keeps tire 5 and 6 new for your next race.
Our answer is still 6.
As far as good tires for cheap, we were very impressed with the Mucho Macho from Cosmo tires.
We were in this recap. https://youtu.be/_xY4Ao0XkZw
Former Captain
1996 Crown Vic. #55
Team Racing Cosmo