Not for that price unless it is actually 98k km and not just the instruments showing that (its five number, rolls over at 99 999km). Parts are pretty near free for those, depends where you live but in Finland you can get engines for those for about 150€.

Check for rust, common spots on mk2 sierras are

Outer front seat mounting points

All jack points

Rear control arms

Front floors, check under the carpet if possible

Rear under the taillights where the side has a seam with the rear metals

Running boards

Looks like it is pretty original except the seats (look like something from a bmw) and the steering wheel and the wheels.

Good price for that would be aroung 3k but sierras are going crazy, hard to tell if the prices are going to hold. If you need more help dont be afraid to ask, i have an identical one to that one (mine is black though) and me and a few of my friends have 7 sierras in total amongst us