the bg 400 pump is plenty..what is the fuel pressure dead headed at the motor?
how do you have the Nos plumbed..i understand you have a fuel log..but what is run off the log ? you got a 4 port regulator ??
you got a pic ?..
i think your gonna find your problem in One or both of these area's
1- timing retard
2- plugs either too hot and GAP wayyy too wide
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "