My '68 Chevelle L35/M21 w/3.55 gears would go well past the 120 mark on the speedo. Now, ..... was it accurate? Who knows.

But I also had a '68 Corvette with the 390 HP 427/ 4 spd and a 3:70 rear. That car had serious problems getting over 100 MPH, and when it did it got VERY light in front, ........... and scary!