1990 Wheel question

[TX '90 ZR1]

I believe the wheels on my '90 are original to the car. Dates on inside rim are just prior to my car build date. I also have the original lug nuts, locks, covers, and valve stem caps, but they are not in the following photo.
My question is about the center and inside of the blades being painted (or coated) black.
How much of a judging hit will this cause?
Here's a pic of what I am referring to:
z 004.jpg