I think it depends on what rules the track goes by. If they use NHRA rules, then I think you only need a roll bar if you run quicker than 13.50. Again, I think, not know for sure. I have no idea what IHRA, or any other sanctioning body's, rules are.
If it's stock (or close to it), I don't think you're gonna run that fast though.
If it's modified, just tell tech it runs high 13's and you should be able to get at least one pass in. If it runs faster than 13.50, they'll just boot ya off the track!