Whilst I am wary of any "reliability" claims (I worked in a related field for many years), it would be interesting to hear from Tony Rudd's counterpart in Packard.
Didn't want to get into pedanticism, but the definition of what constituted a "failure" would need to be agreed or tailored to allow a valid "apples with apples" comparison.
I knew a few old-timers from Packard but they're all gone now. The head of the engine testing dept. was Russell Snowberger, the old Indy racer, but he passed when I was a teenager.
The stories I recall were mainly about all the tremendous pains they went to in duplicating the Merlin engine -- for example, moving heaven and earth to get British thread forms made. There wasn't much in the way of bragging about improvements to the engine.
...Other fun facts not in this newsreel. There was a Ku Klux Klan chapter at Packard during the war. At least one of the WWII Detroit race riots started in the plant.