Timing Retarding @ high RPM

I've seen timing retard on the old Mopar orange boxes. Was always told that's how they were designed. I've used the chrome box. No retard. I'm not gettin in this fray, just saying what I've tried and seen. I've also heard and read here on this forum that the old Standard LX101 box does not retard timing. I've never verified that myself. I cannot remember......it was either @moper or @oldkimmer who said that about the LX101 I think. Maybe they'll chime in.

Also, I cannot speak about the MSD stuff, as I have never used it. I know people who do and have never once heard them say the box retards at high RPM.