Replacement 68 340 four speed cams

Ceedawg said
What if I had a 78 LRE core with a bad lobe, could this be reground back to original?

Yes

Ceedawg said
What if I had a 78 LRE core with a bad lobe, could this be reground back to original?

Yes, but the base circle would be reduced so...custom length push rods may be in order unless the valve train was switched to adjustable. It would be best to take a blank core and grind new to maintain stock components if stock is the goal.