These old engines can last virtually forever it seems. My sat for 17 years before I dropped in about 100 bucks and drove it of the shed it was sitting in. My advice is this rebuild the entire fuel system. Blow out the fuel lines, rebuild the carb, clean repair replace the fuel pump, pull the gas tank clean it and seal it (I didn't do this and went through a heck of a tough time keeping the gunk from the tank from clogging the system do it sooner then later). When this done before you drive it away check the brakes if it has set awhile they will need work. All told it is an afternoons work and little else. Also I would recomend changing the oil, coolant fluid, and flush the raditor.
Eventually a rebuild should be consider but if the vehicle was parked with low miles this doesn't need to be to soon unless it is to become a daily driver.
