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"Also, I've been told/informed (by cam people, in answer to my Q re reground cams) that NO ONE rehardens the surface on 'reground cams'. Anyone have an opinion whether that is TRUE?"
False.
Many cam grinder's reharden reground cams, both steel and cast iron.
For mild street grinds on steel cams such as the model A/B there is not enough material taken off to go through the original hardening which is usually.080 to .090
deep.
The black or brown finish on some cams is Parkerizing. It is not original as Marco has said.
It is however very helpful in prolonging the life of the cam.
It helps to retain oil for initial break in.
It is best applied to cast iron cams.
Steel cams do not benefit as much.
Purdy: A reground cam will last just a long as a new one if done properly.
"Been in the cam business 59 years"