Per the "Won't Rev" thread, which should be allowed to rest in peace, the car would only rev so fast in 3rd, but could keep up with traffic in 4th.  I rebuilt the carburetor to "rule out" carburetor issues.  Oh, the car runs sweet at lower revs.  And I developed great skills which I may never have to use, but I can tell people about.   I took a more extensive drive this morning.  Starting in 3rd, it goes well until it approaches 25.  Then it stays at that speed, no matter how far I pus