i tried retarding the timing somemore it got worst it didn't let me get higher in the rpm i also bump up the fuel on 8 it's perfect but on 10 psi it starts to bog out whatelse can i try tomarrow i'm going to get ngk 6 is there anything better than that i don't have a msd do you think that it can be that i'm not buring up the fuel quick enough at 10 psi and 450 injectors where should i be around