JD 70 Cam Followers

I am rebuilding a JD-70. I had the cam ground (Which didn't look bad) and have a question about the followers. The followers didn't look bad so I took a piece of glass and various grits of paper and cleaned them up. The lifters seem perfectly flat and have a mirror finish. The question I have is do the lifters need re-hardened? The cam came back black colored from the machine shop so I assume they re-hardened it.
 
Cam followers should NOT be perfectly flat. New ones are convex. A few thousands higher in the middle. Most cam shops can resurface the followers. Here in Illinois we use Effingham Regrinding Effingham IL. there PH. is 217 342-4186. Black cam coating is called Parkerluberising (SP) ?
 

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