Value of a 1969

Does anyone have an estimate on the value of a mint condition 1969 Corvette Coupe with the following parts

427/435HP (Tri-Power naturally)
Every factory option except tissue holder, the vanity mirror was ordered instead
Now here is the wierd part, it is a 427/435 with Air Conditioning, GM never offered that car from the factory. So this car was ordered with the 427/400HP motor but when it came in, it had airconditioning, it had the 435HP placard on the console, 435HP on the air cleaner, and upon blueprinting of the motor it was proven that it was a 435HP version. Was this a common mistake made by GM or is this a rare car?
The car also has 80,000 miles but is in beautiful shape. The car has a fresh coat of paint and classic pinstriping on the rear, around the wheelwells and on the hood. The car also has been modified it has re-jetted carbs, hooker super-comps, 12:1 pistons, ZL1 cam, titanium valve springs, and the heads have a mild port. Usually mods deter the value of classic cars but this car has been in this state since a week after its inital purchase in 1969. The car comes with 3 rear ends, two sets of aftermarket headers and sidepipes, a GM accessory lake pipe kit, stock underbody exhaust, and all the stock part that came on the car the day it was bought are still with it, including the spark plugs and tires. The car also has an upgraded clutch. It comes with an aftermarket front air dam, but it is not installed on the car. Finally the car is numbers matching and does has an M22 rock crusher. This car is not for sale, but because it is in essence a "miss-print" my buddy and I are curious to its value. Also, it is a one owner car if that matters. Oh and when it was purchased it was the most expensive Chevrolet ever sold in the state of Kentucky up to that point.

I saw 427/435s with similar mileage in Hemmings for $70,000-$90,000 without A/C and I read a while back that on any big block A/C adds up to $30,000. Is that still true, and if so is it more than $30,000 because it is a 435Hp.