Also the guy has all of the parts but he hasn’t the time to do anything as he is too busy with his son who is unwell.
Let him tell what parts. Might give an idea what needs to be done.
As Onur said: Be prepared for a project; mentally and financially.
If a y possible: Have a not involved, thus non-biased person with automotive knowledge check the car.
Check for rust as mentioned: Window frame, door sills, gutters, rockers, wheel wells, frame (also on top), any mounting points for suspension, axle linkage,. floor panels, foot wells (under carpet!). A magnet helps on places often affected by bondo, e.g. wheel arches. Be suspicious on any are that has fresh paint or underbody sealant on it. Check the hardlines for brakes and fuel for corrosion, as well as the fittings.
Engine compression test would be good, testrun is a must. Listen for weird sounds (windows down), check for smooth shifting, straight run and good steering.
Also test the 4x4 / locking hubs. Slowly drive sharp turns in 4x4 with steering full to one side: Any knocking noise in the front? That would indicate weak CV joints.
Check for oil and other fluid leaks after the testdrive. If any possible: Get it on a hoist and check play of wheels and steering gear and prop-shafts.
Check coolant and oil. No mix, coolant clear, no bubbles in coolant, no milky cappuccino oil, no oil leaks, no coolant leaks.
A 4x4 is bought from under it. So: Bring a torch and goggles and crawl under it.
needs a new exhaust, and a good bit of TLC in the inside.
Be aware that trim parts are the most difficult to get for old vehicles. They are discontinued first and break first.
Usual stuff like brakes, wheel bearings, knuckle assembly, stearing linkage, belts, hoses, soft lines in brake- & fuellines, even suspension and exhaust can all be replaced fairly easy (if you can wrench yourself), thats just time and $$ (and fun). (Be prepared to do it sooner or later)
Engine, injection pump, alternator, servopump, gearbox, tranny, diffs and body: That's what matters.
It's an adventure, but also great fun.
Good Luck Ralf