Carl my wifes 406 is making about what yours makes...i have a 750 holley on hers and i run it 74 square...
the best way to make jet changes is 1 size no more then 2 jet sizes at a time..outside of the obvious ( sitting still reaping raw fuel).....when you make a pass at full throttle..kick it into neutral and kill the car at the end of the track..if someone can towe you back great.. or you have a spot you can pull over on the end of the return road to where you can pull out a few plugs and see how they look.....never drive back to pits and try to check them..the drive back will distort the plugs from their true reading at WOT......
if the plugs are black and sooty ( wet looking) then you know right off hand your too fat ...and work back from there...
i wasn't trying to butt in too much and dominate the reponses..but it sounded to me from post one it was over jetted..
Brian
__________________
Bjuice..
"I'M YOUR HUCKLEBERRY ! "