Fisher, Chevy only painted the front fenders hood, and upper and lower valances, basically the stuff forward of the firewall, Fisher painted everything else.
Just from looking at the pictures in this thread, it's hard to tell if the cowl was painted before, or after the firewall blackout. I'm assuming Fischer did the blackout.
In the most recent resto of my 68Z (late 90's) the most accurate info for the cowl paint was that it was pretty much the entire cowl section that was painted stripe color. That's the way I did it, at the time. Others have said that it was masked off so that only the area under the cowl panel was painted.
I have a NOR car, and the pictures of the cars here pretty much confirm that I'm in the ballpark, as far as paint coverage.