That does sound fun as hell!! I had a 89 5.0 LX that I redlined in overdrive one night running a Mazda RX-7 but I had one of those 85 mph speedo's so I have no idea how fast I was going. I do know it gave you that uneasy feeling though because you couldn't even feel the road underneath you. I did it on 75 South between Tylersville Rd exit and the 275 interchange if you know where I'm talking about Ackbar00. That has been the only time I've been worried about crash and burning.
That's why my comment about his front end because the newer mustangs handle like a dream at high speed.