I used to run the 64 Barracuda up to 140 mph every month when I lived in South Dakota. That was with a 273 and 4 speed, not stock. The car was stable and could have gone faster. I was aware that if anything happened at that speed, I'd be gone, but I was in my 20's and invincible. Where I wound it up was nothing but flat pasture land, so the most I would take with me was some fencing.