There are no breakdowns on production numbers on color combinations that I am aware of but there is a generic listing of how many RPO coded items where built. However, it is very vague and would really not tell much other than how rare a certain option is. Tripple black is actually quite common especially on LS-6's. I think a combination of purchases for the purpose of drag racing (origls6) and moonshiners (Benchmark LS-6) was the reason for so many black cars.
I am currently finishing up on a Shadow Grey LS-6 from MA. Welcome to the site.
As Dennis stated, we would love to see photos of your restoration progress and information for entry into the LS6 Registry.
Rick