[1968 GTO Resto-Mod]

trying to make sure the original axle shafts are in reasonably good condition before planning to reinstall.
i have already replaced bearings and races, and applied primer coat, as you can see in the photograph.
both shafts are straight, splines look good, and there doesn't appear to be any outwardly visible signs of wear or damage.
what else should i be looking for?
are there any significant drawbacks to using the original axle shafts?
danny