Hard to tell DRM, without seeing it. But, an 84 car with 70,000 on the ticker is going to have it's issues. Did you see the interior? is it in perfect shape? If so, 3 grand would be good. Did it see winters? If so, you are going to deal with plumbing issues at some point. Gas pump will need to be checked. Are the sail panels in good shape. I think you cannot get those anymore.
Bottom line...If you want a little project car, go for it.