2001 5.9 Magnum questions
get everything you can with it-- even if you don't use it. the mounts, the pulleys, exhaust, flex plate, bolts, nuts, wiring and things, stuffs, whatzits and whatnots.
it's one of those things where it absolutely kills if you have to go find [blank] at the junkyard or the project can't move forward because of some dumb missing bolt, and it's $4.89 you have to order five of them and shipping is $14 and they'll be here a week from next thursday.
beyond that, make sure that it's complete. that it hasn't been sat outside with the valve covers off or the intake exposed. take a breaker bar so that you can make sure it's not locked up or that it doesn't sound like two robots are ******* when you turn it over. check the oil and see what's up: if it looks/smells like normal *** oil, bueno. looks like tar, then it was neglected. brand spankin' new, be suspicious-- people be changing oil trying to fix a problem that an oil change can't fix. milkshake? walk away, you don't want that problem.
other than that, these things are surprisingly robust. at that mileage you might get away with a hone and rings/bearings and just snapping it back together. rumblefish hit it, you can go a long way with stock components. if you're gonna spend money, buy heads. magnum heads are prone to cracking, so get a professional eye on those for sure.