Hi ... I have an 83 CJ7, daily driver for many, many years. Has the 258 I6, weber 2bbl carb ... very reliable, even on long trips. When you inspect this '81, look for rust around the body mts, inspect the midsection (under the door) for body-work where the frame may have been bent, take a wheel off and see if brakes have been refreshed, 4WD must work, no question, good oil pressure?, dirty oil underneath - not to worry too much ... Jeeps always leak oil. Lastly, just a caution ... has the Jeep been lifted? Poor lift work will mess with steering stability.
Good luck, Jon