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Being the son of an owner of a classic car restoration shop that specializes in Corvettes I can honestly say original colors do add some value. But by no means is the original color the end all/be all, especially if the color is not a popular one.
I remember having a '70 Corvette coupe original blue paint with black interior on the lot for 2months with no interest. We stripped the car, painted it red and it sold two days later.
Unfortunately not too many people had the privilege of ordering a Vette with their color of choice rather than buying one second hand accepting subjectively a not so perfect color. So a color change would be the answer....But doing a color change if not perfect in every way and 'no shortcuts could ruin a car which has been mentioned. 68 Yellow, 'Safari Yellow is not a bad color, I like it.....However Black is very desirable too, but do as you prefer..... .
I was going to change the color of mine from Safari yellow to Cordovan Maroon. Then the yellow grew on me, and so many people commented how they would like to have an original 984 yellow car. Your question was about value; that means you are concerned only about what it is worth, and not so much about painting a car for yourself to drive and own. As stated in earlier posts, the car is yours, do what you want. If you plan to sell the car in the next 5 years while the paint is still excellent, you will want to consider your potential buyers, and the members here like paint codes to match the color. The cost of a repaint is 7-10 grand, so a buyer will take that into consideration when looking at your car. It is a tough place to be in when selling. You may also consider that a 68 is the oldest C3, and the number of clean, original, well-kept cars is dwindling. If you have one in great condition, it will most likely make it more valuable than to modify it.
Convertible sharks, especially the early chrome bumper cars, are sought after more than any of the others. If you change the color on a matching numbers 4 speed, you are going to be sorry when it comes time to sell. The money you are spending on the paint as well as much of the restoration could very well be out the window. Hey, I was looking at black and red cars but ended up with a '69 daytona yellow. It really grows on you the more you look at it. It stands out at the shows and I get so many comments wherever I go. People are always asking me if it is the original paint, which it is, and what the name of the color is. These early vette yellows are nothing like the screaming loud yellows they paint cars today.
I almost bought a beautiful yellow/black 69 Convertible small block (that needed nothing) when I sold my 90. It was about $15K. That was in 1991. Damn!