Jim! This is exactly what I needed. I was cleaning way to close to the pumpkin and my jack stands are probably right in the way of where the code actually is. And dang, is it ever faint (from your photo).

I'll go back out tomorrow with renewed zeal and find that dang code. I'm expecting to find "YC" to confirm it's the original rear end. Supposedly this is an unmolested car. We'll see.

I'll update with my success. Thanks very much.