[Gaz64]

On any pushrod engine suffering from bent pushrods, the usual culprits are insufficient valve retainer to guide/seal clearance or rocker to stud clearance.
Something in the valvetrain is not correct.

The distributor drive gear is too high in relation to the cam drive gear, either fitted too high on the shaft, as observed by the new hole in the driven gear, or gasket too thick.

The wear pattern and resultant gear tooth failure shows this.

Gary