I remember when I was doing my first "Stocker Crank" in 82 or 83 that I had to bring in 3 or 4 Cranks (std size) to the machine shop before we found one they could use to get it both indexed and stroked for me at .010 and .020,I dont remember what max undersize was back then but you didn't wanna go to .030 and dont have another shot at grinding it, if someone already had turned a crank .010 at the rod for some reason it most certainly was waste for a serious Stocker engine,since those days they allowed more and more undersize and also aftermarket parts that was nowhere on anyones horizon.
p.s. I personally think it was a good move for the FE Fords to get the Chevy Rod,they messed up the tracks pretty bad before that