oRIGINAL paint is a huge plus, although that would have to be verified in person.
Rebuilt engine is nice, but w/o documentation, won't add much to the value.
Nice running and lack of rust would be the biggest selling point. Get a paint meter and record (pictures) at various places around the car. Especially the doors and fenders.
Driving video and a nice, detailed walkaround video too. That helped sell my cars.
Remember, people are buying from all over the world, so the better information (pics and videos), the higher the selling price.
Good luck!
And yes, you can sell those recaros for good money. Easy to swap seats. Get a new carpet (fairly cheap) and put in your original seats.