New lifters on a used cam

New lifters, old cam is the old standard 'OK'. Been done that way for a looong time.

I am not sure if the break-in needs to be followed; work hardening the cam surface is what I understood to be going on. But why take a chance? And if you are using stock springs and lift, with the lower lifter-to-lobe pressure, it probably will be OK, but again why chance it?