[FED 387]

when u say trigger gap do you mean the wheel on the crank?? if so it should be at least(from what I've been told) .060 to .080-- the more gap you can run the better do not know why but what I always was told--- big block engines especially ,the cranks flex at higher rpms closing up that air gap !!!! have you tried twisting the wires on the pick up??? the full length this can help with RF interference