What you can sell it for is basically dependant upon its condition, i.e. will the engine run, is the gearbox in working order, is the clutch in working order and do all other moving parts move freely. If the engine is in good working order I would be interested in buying it for the engine as I have been looking for a replacement. Given the time it has been standing you will need to ensure that the engine is not seised and preferably do an oil change before trying to start it.