That is really a tough question.
Not sure how much value the 57k miles brings when you have torn everything down and rebuilt the engine.
So coupes don't bring as much as convertibles, Fastbacks and Mach 1's, and you have the base power train. In addition you have it in pieces, so it is not running, or driveable and you don't have a complete interior in it.
Is the body painted?(The yellow in your signature pic?) +1
Nice wheels and tires +1
Brakes have not been completed. -1 (If the old brakes are still on and function this is a neutral.)
Interior not installed -1
If you have any bandwidth to do anything, I would suggest installing the interior if the body is painted. A pretty, yellow car that rolls and just needs the new engine put in looks like a better opportunity than one that needs both interior and mechanical. If the car looks clean and has a clean interior, a box of parts to upgrade the brakes IF I WANT, and a fresh, proper date code engine, ready to go in might get you more traffic for sale.
Price, I wish I could help, but its whatever the person hands you when you are ready to let it go. So my opinion. As you described it I would say $2000-$2500, if you have good paint, the interior in and the new wheels and tires on it so it looks good, maybe up to $4000. But I can be way off either way as I am not a buyer or seller right now.
Hope my opinion gives food for thought.
kcmash