Poor quality parts ruining the hobby for me

At least I'm not alone. I did take some advice from these comments. I found an original Chrysler brake distribution valve and rebuilt it. It doesn't look quite as shiny on the outside as the two new Inline Tube units that leaked, but inside it must be good because it doesn't leak. And something else: With my experience disassembling the original valve I compared the internals to the 45 year old Chrysler part and they look close but not exactly the same. I am not sure this was the problem but certainly suspect. I also recently located a correct Chrysler master cylinder from 1971. I will rebuild that and feel more confident that my brakes will be there when I need them.