Headspace gauges are really all you need.
If the headspace is tight, a reamer will correct it (can probably do it by hand with a tap handle the few thousandths it will need to be moved), or a thicker recoil lug.
If headspace is long, a different recoil lug (thinner) can solve that. Again, we're talking a .005-.010" window here for most actions.
Caliber markings, sights, etc.. anything on the barrel most likely won't line back up.