That 2 speed power glide would grab high gear typically around 10mph, certainly 15. I can’t imagine driving that car 70mph. iirc the 283 v8 was doing 3000rpm around 55 or 60. Spec steering wheel PLAY in that car was between 5-6” and 4 wheel drum brakes on a single circuit with no weighting towards the front was a handful at 55. No sway bars, and crummy aero. People say they’d get these things up to 100 ... and that’s ludicrous to me.
Here’s the rest of the story...Wow!