The '70 model is a chrome bumper model that generally brings a little more than the post 75 rubber bumper model. However, some people prefer the 72-74 that have the round rear wheel arch. The '70 model is the first to have thin bumpers, with the rear split bumper. The bottom of the A-post/bottom door hinge are some of the first areas to show excessive rust. The MIDGET lettering is on the rockers, so it could indicat a hidden problem. The A series engine can easily go over 100,000 without a rebuild, and they are cheap to rebuild. The lever shocks are also likely to have been neglected. Check for leaks and excessive play. You might also check to see if the rear springs have excessive sag. A driver that needs no immediate body work could range from 1800-3200 IMO. This all depends on the condition of the interior and engine.