Found this on-topic thread in a search..
Also regarding the backing plates..
I aquired a used pair that have splash shields welded to them. I didn't know splash shields were ever added to drum backing plates and thought someone must have once added them. I was also considering removing them until I did a short Google search and found some with..
The afore mention In-Line Tube website has the option of with and without..http://inlinetube.com/Drum%20Brakes/Drum%20Brakes.htm
Question: Where the shielded plates ever a Camaro option, standard or never available on them? If not, what were these normally fitted to?
Also, looking at the ones that I have that came off a 68 Camaro (no idea if original to the car), were the welds normally that rough? This is mainly why I assumed a back-yard welder had added them.