It just looks like the motor is numb at the hit.
What are the 60' times anyway?
ET & speed?

Timing, jetting, float level, cam size, low gear ratio, etc...... Could be any of those things or more.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads