I have done this a few times, going sledding in Montana, and a trip to Idaho last June. You need a export permit from your provincial FW office. Costs about $25.00 here in Alberta. Has to be used for personal consumption. The trip to Montana was hell. Had a cooler with about 4lbs of moose burger and 1 roast all frozen. Had the permits, but US Border guys (2 of them) didn't know what to do, sayiing can't bring it in, and was going to confiscate it, saying the permit was invalid. After being in line for about 45 minutes, the border guys' superior came over to see what the delay was. The 2 guys said what the problem was, their superior looked at the permit, said everything was in order, filled out correctly and told me to have a nice trip, sorry for the delay!
My suggestion is you check with your local FW, and then make sure you tel the the border guys. If you don't and they decide to check your vehicle, you will be busted, and be delayed, meat confiscated, and possibly turned away at the border.
You're 1 lucky guy to goto a NASCAR race this season, hopefully next year I can make it to Daytona!
Enjoy your trip/race.