For me, with the various ol vehicles I have and have had, I take a look at what their advertised max speed was when they were being sold and use it as a type of measuring stick as to how fast I should attempt to take it. On my 47 D24, Dodge advertised 80mph as the max speed for the car. So that was my target while restoring him. I'm proud to say after replacing and repairing from front to rear, ol Doc and I can achieve 78mph at 5,000ft ASL. He'll cruise down the Interstate at 65mph all day long with one finger on the wheel. The only issues that come up is he may get a tad bit warm after pulling a 5% grade or steeper for a few miles. Going to slightly wider tires helped with the excessive hunting on the highway. Speed demon, he's not. Able to take extended trips at a reasonable speed, most definitely.
