I agree with all that has been said above and wish you well with your sale.
The car has a build date of 5/73. One of the most noticeable items in the photos to me was the carburetors. They are the earlier round top Hitachi version which, by this time in 240z evolution, should not be original equipment. I suspect that the flat top carbs were changed out, as is often the case with 73 Z cars, in favor of the "easier to maintain" earlier carbs. This could have been done at the dealership within the first few years of ownership. Regardless, it appears the conversion was done properly by those that did it.
Additional photos of the underside of the car, close ups of the battery tray, rocker panels, floorpans and inner fenders would be helpful to discriminating potential buyers. (although, if given, the presentation likely will not yield any surprises)
To me the documentation that goes with the car more than offsets the dip in value usually seen in 73 240Z prices versus the earlier cars and the perception that this color is the "least desirable". It is readily apparent that this car WAS loved very much by it's owner. The condition of the car is testament to his care.
There are several additional minor details that would need to be corrected by a purist, but the car is a rare example of a truly "period correct" 240Z.
This car certainly deserves a commitment by the new owner to match that shown by Mr. Fulkerson.
I believe that this car could fetch a high #2 to low #1 condition value and will be the grist of much discussion if offered on www.bringatrailer.com
Thanks for posting this topic and keep us updated as to the progress. It will be interesting to follow.