How do I sell my 1987 Mustang 5.0 Hatchback with 64K original miles? What can I expect to get for it?

Look on Kelly Blue Book (can find it on line), and look for the low and high price. Be reasonable and objectionable... of course you want the most for it, but when deciding a price, put yourself in the buyers shoes... if you were buying this car yourself, what would you pay? Also, be honest with issues you know about (is there a dead cylinder? any damage besides normal door ding or scratch, such as wreck damage, even if repaired? so on). There will probably be some haggle over price before you actually get it sold, but inform yourself (blue book price, mechanical repairs, so on) so both you and buyer get a decent deal. Keep in mind, some buyers will be alright if engine/transmission aren't in good shape as well (they may have engine/transmission they want, just need the body).