not if the dwell starts earlier. it can be manipulated electronically. i've checked several orange boxes, and one chrome box, to 6000 rpm- no sign of retardation (pardon the choice of words). they are all old boxes, though. i think my newest one is over ten years old. i think ballast resistor selection is important, too. iirc, there are two resistance values available? i have always used the higher resistance, and have had no ignition issues ever (aside from a ballast resistor failing at an extremely inopportune time).
In the other thread about this subject it is claimed that there was a change made to them in 2000. So if your boxes are older than that it doesn't help with this question/problem.
