I realize this thread is a little old but just in case this type of event comes up again... I'm pretty sure that is a 1/8 mile track not a 1/4 mile track. Your "average Joe" isn't going to own a vehicle that runs a 5.8 index in the 1/4 mile and if they did, the buy in would have to be a lot more than $75 to make it worth their time.
From most of the time slips I've seen for the Stinger GT, the 8.0 index would be perfect for it.