The Mopar boxes all retard timing at high RPM, with the exception of the Gold Box. and those are a beeotch to find. That can be useful to prevent detonation, but if you're running race gas or you have a pump gas engine, that retard feature.......is retarded.
Standard Ignition #LX101 is a great piece that does not have the timing retard feature. They are all over Ebay at good prices. O'Reilly is also fixin to start carrying Standard ignition in all stores. The change over will be done by the end of the year. We are changing from BWD (Borg Warner Division) to Standard. We will even carry the once defunct Blue Streak line from what I understand.
Good luck!