In 1958 the speed limit in Tennessee was 65, on 2-lane roads, and everybody ran 75-80 or more every chance we got. That included stovebolt cars, and more than a few trucks. I've seen 100+ on the speedometer of my 58 Chevy 2-door sedan with the 235 3-speed many times. When I put the 61 Corvette 283 in it, it would really get up and go, and that was with a 3.70 rear end and relatively low-profile 14" tires. The main speed-limiting factor on some of these old trucks is drivers who don't have the C.O. Jones to mash the loud pedal.
Jerry
