Hi IH.., welcome..!
Long/short., Look for "beauty only skin deep".! Meaning a pretty paint job on a pile of junk, to be blunt... >

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However it's all cleanable/fixable... these are tough, old-school rigs that any semi-mechanic can work on. There's nothing odd or unusual., Every part is available/replaceable. Most everything is "metal"..!

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Many folks find out that these EB's are valuable & try to get a high price on a rig that's a run-out.
They attempt to take the equity due the buyer/new owner, that will spend the blood sweat & tears fixing these rigs up.
The closer to "stock" is a better buy....you can then do the mods you prefer.
Drive it..!! Steering ,brakes, smoothness, noises, vibration.., even smells can give clues. Crawl under, over, around...looking for problems.
At the end of the day., it's not really diff. than buying any other used car/truck.
HTH,
B