Replacement 68 340 four speed cams

In 68 I had a Honda 305 Super Hawk. One night I wanted to see how fast it would go, Rt 3 had just been four laned with a long straight stretch. Laying chest on the tank (no helmet) my nose on speedo I got it to 105 mph, over 9 grand on tach. It was very unstable, aerodynamics I guess, I came to my senses and let off. Thinking back it’s a wonder we made it this far with the dumb **** we did.