Blue streak cap and rotor experiences?

I have a few old stock Delco rotors, I felt safe with buying those and them being a good piece, since they came in one of those old cardboard "cans" with the crimped metal caps. Probably late 60s or early 70s stock. I have a few each of those and the caps I talked about above, probably just enough to last the life of my newly built slant 6
Unless I'm in a "gotta have it to get to work tomorrow" kind of bind I don't buy many current made ones from any of the parts stores. I have to at work for the vehicles I work on daily, and the last few Magnum engine ones and GM ones I've had to buy from Napa haven't lasted worth a damn.
Echlin used to be among the best if not THE best ignition parts back in the day ,but aren't any more.