13.6 with the above mods?? That sounds a little on the optimistic side. I'm going to give you the benefit of the doubt with the time and say that your car was hooking incredibly well. I do however have a hard time believing you cut a 1.6 60' time on stock tires. Slicks, yes i can believe it but there's no way on stock tires. I've got Nitto 555's on my Cobra and my best 60' to date is a 1.97.

Post the slip. What was your trap speed? With a 13.6 you should be trapping somewhere near the 101-104 range.