came across a 4C built Z28 yellow with yellow hounds tooth trim

[montgomg]

If Winvoices estimates around 600 coupes with the yellow/yellow combination then
there would be around 50 Z28's with this color combo as the z28 production was around 8.35% of total car production for the 1969 production run.

Is this correct?

[william]

Probably not. Statistical interpolations quickly run off the rails.

Certain colors were more popular on performance cars. In this area, I recall 5-6 76 714 Z/28s. The db has just over 1,600 Z/28s; 20 with 714 interior.

[montgomg]

Small sample size but your numbers would result in about 290  76/714 cars.
Thanks

[william]

Well there's that statistical interpolation thing.

Yellow was not available to order until January; first cars built late February.