It would have wound up in the trash, so I hope this helps keep the engine a little cleaner when adjusting valves. Even the cut piece makes a good cover;)
You may find the cut cover unneccessary. Slants oil the top end dribbling oil out of the rocker arms. I've never had one splash or drip, even when setting hot with the engine running. YMMV of course, but it's a whole lot cleaner operation than my old 350 Chevy.