In HS a friend of mine and I were building a 5.0 Stang for him that we picked up cheap. Him and I rebuilt the motor with lots of goodies, and once we broke it in we took it out on the highway and hit 155 (him driving) and it had plenty left in it.
Funny thing though, the car was a project so it had the hood off at the time, and the entire interior was stripped, no back seats, no door panels, no carpet, just two seats and belts. Not even any weatherstripping in the doors so the wind was blasting through the door frames. Nothing like a metal coffin going 155, what a rush.
As for me, I've been up to the governor limited 130 in my Camaro. I'm an idiot though, I did it with the Ttops off; the wind buffeting at that speed can blow the rear hatch glass clean off...I got lucky.