Joe, we've talked about this car a couple of times. I know what the seller wants for the car and I think the number isn't too far off its value. The interior isn't quite correct and you mentioned the engine compartment needing some cleanup so there are a couple of bargaining chips in your favor.
There was a time where hardtops and convertibles commanded quite a premium over the sedans and two door cars. But, like many non "investment grade" collector cars, prices have softened as market concentration narrows.
I like the color of this car, it's unique and really adds to the hardtop's unusual construction. You would certainly have the only one at any show...including a KF convention it seems.