In my opinion, when you enter the 600.00 realm you should be/start looking at a shootable rifle that is basically as issued, that is to say with components that match the serial number. when you enter the 600 range you should expect a stock with the cartouche and the circled P or at least a good field-replacement stock with the inspector's initials behind the trigger guard.
"A man with a tractor and a chain saw has no excuses, nor does he need any"
Me. "Consistency is the hobgoblin of little minds" Emerson "Consistency is the darling of those that stack wood or cast bullets" Me.