That is one school of thought, just throw a bunch of money at something without learning anything. Others might say, if you are running 33" tires or less keep running the stock stuff. Drive sympathetically and you should have minimal problems. If you break something, secondhand spares are cheap and easy to install. That said, the RT stuff is relatively inexpensive, especially if you factor in the potential costs and time for repairs of broken factory items, and pretty much eliminate the potential for shaft/CV breakage as I understand it. Mind you, if you swap the axles and CVs you still have to do something about the weak ring and pinion so if you have a heavy right foot you will probably just break something more expensive and difficult to change. Anyway, just wanted to point out that there are options and there are people running stock setups out there.
Of course now that I said that I will probably break something
I would say put those CV's back together and see if there is any free rotational movement in the joint. If so you might want to replace, there are probably specs published somewhere but generally I don't think you would want any perceptible wear in them.
Originally Posted by KevinNY
Answer depends on if you are going to wheel it or is mainly a road vehicle. Show piece, put them back in. Wheeler, Rovertracks CV's.