I am going to say 11.89 to 11.99 it takes a lot to move from 12.04 to 11.70,, the stacked pulley will do it if your lower pulley is the 185 ,,but now don't melt your pistons get a afr gauge and read 12.3 and under for AFR reading.
Oh a lot of people don't like to have a reading above 11.9,, mine has been 12.3 for 5 years,,, because you ONLY read that at wide open throttle ,, jim