Well, 34 years with one owner whose reputation would be at stake if he misrepresented it counts for something. I don't think the price is out of line and I have seen it in person although that was five years ago. I think the new owner will be happy.
Edit: I have a database of sales prices over the last two years with 54 vehicles. There are 19 Haggerty Condition 3 coupes averaging $40,000 but if I cherry pick the best 7 the average is $58,000. And I have also seen a few of these in person.