To do it right it has to be sloppy, they masked the fenders off around the cowl and blasted it getting overspray on the firewall.
The front was just blasted too, overspray is proper. I masked mine off, I just couldn't do it .
I read an article on this a few years ago, the cowls were done in 1970 only, the fronts were done on all years. my car is FE5 as well and the research I've done shows some cowls in this color were done at factory, an original owner car I found was done but I've seen others thar were not.