Well I'll be, the book is wrong! I got this from the HP Books "How to rebuild Big Block Mopar Engines" so that is a pretty big mistake for sure.The drawing is incorrect.
It depicts the offset for the valve end of the rocker to be on the same side of the rocker as the pushrod offset...... which is clearly not how the actual rockers are.
The valve end offset is on the opposite side as the pushrod socket offset.
They install on the shafts so that the pushrod sockets are towards each other, and the valve end offsets are away from each other.
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I keep stuff like that as a reminder. Did a valve job on a 318 put one shaft upside down and that happened.I would be very concerned about wear in the rocker pushrod socket
This is a known weakness for the factory rockers
High lift cams change the angle of wear inside the cup and produce a weakness that eventually cracks the socket
Placing those rockers in the wrong order has produced a new angle of wear inside the socket no different from changing to a high lift cam
Inspect them closely and dont hesitate to replace them
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(for those that notice, this picture was taken many years after the failure and the rocker sat under a work bench for years. That's why it appears so rough)