I doubt that a 2007 Grand-Am GT spec 350Z can come out of retirement and challenge for the Unl overall at Redline/SLB as-is, especially with the gains seen in TA recently.
However, if they add some power, reduce some weight, run better tires, and bring their full crew including big $$ engineers and their
paid driver, then I bet they will be able to challenge for the overall (assuming they have solved the teething issues that plagued this car when it was raced in 2007)
Either way, I would love to see them come out and race! Just watching how a pro team operates would be a great learning expirience for the TA regulars who havent ever seen a pro team work up close.