Sounds great. Don't doubt that your Z will get up to 160mph. I was able to pull at least 130 down the main straight at Watkins Glen and I didn't have the brakes you have. If I had better brakes, I bet 140mph would be no problem.
I can see it now, you are driving through Montana on a trip across country and you can see down the road for 3-4 miles, you are just cruising along at about 80mph. A new C6 Corvette blows by. You decide to show the vette what you've got. You drop it down to 3rd and floor it. The rear breaks loose for a second and you keep it in control, you redline 3rd, shift to 4th, take 4th to redline and you are gaining fast. As you shift to 5th, you catch him. By the time you get to redline in 5th you have passed him by and you look down at the speedo and you are doing 165mph. Feels smooth as glass.
Then you wake up!