My dads 6.2 ran 340,000 miles before it lost a head gasket, so he rebuilt it and did the banks sidewinder turbo kit on it and has been great so far. Yes it did loose a couple of injection pumps along the way and no it is no powerhouse but all things considered its been a pretty good pickup. I would personally never own one when you can buy a 12v cummins for around the same price tho. I would never own an older non turbo powerstroke either, they don't have any guts.
The only problem with the 12v is that the dodge comes with it. If you look for an older dodge 12v try to find one with a manual trans as well.