I have asked this question here and YB without any real solid replies.The Holley pro strip ignition system in my junk allows me to change the timing every 500 RPM.There are parameters of retard for nitrous oxide and boost.Someone should do some research on the dyno with more advance in the lower RPM range ramping down to 7500 to 8500 RPM.

HEMI-ITIS has no cure.
My condition is fully BLOWN!!