my used cam

This is going to sound like a bashing, but here goes...
Either you misunderstood the man or Comp cams has started hiring total idiots to answer questions. Only a fool would put used lifters on a used cam out of order and expect it to be okay. "Probably be fine" ? Really???? Do you realize that when the cam and/or lifters fail, all the shavings will pass through everywhere the oil goes, tearing the hell out of the oil pump, crank and rod bearings, valve guides....
"Probably be fine" is a terrible risk to take.