what's it worth

Looking at a couple used JD tractors. one is an 86' 1050 with 2500 hours, the other is a 68' 2020 with no hr meter given what should the price range be for these in south eastern pa.

Any help would be appreciated. we need to get a tractor with loader to maintain a 4 mile stone mountain road/driveway and mow 35 acre. I am certain my little powerking can't handle the job.

Thanks, Chuck