There would only be a bee's doodle between them, if you can find a late 3.9 rangie in good clean condition in your price range buy it otherwise as said previously you will get a good younger disco that will have better electrics as most likely require less constant maitenance than an old rangie- lets face it the youngest classic is 13 yo by now but a disco can be had that is 96-98 for your price range.

