Well if the truck is in good shape, then the engine is replaceable. And if you dont want to pay for another 6.2, just drop in a 350 for about 1500.00 and you will have a truck that will run 4 ever. The k-30 has a very stout drivetrain, gear drive t case and the like. Something that cant be found in any truck today. I just wish it was near me so I could buy it.
I am not the biggest and I am not the best but I fall somewhere comfortably in between.