put a #75 jet in the fuel side, more motors are hurt by having it way to rich on the fuel side than by having it slightly rich or equal jets on both sides Do you have extra jets for the plates, if not get some before playing with it. I'm not sure how much HP that #73 NOS is worth, anybody?I would probally try a smaller jet in both before stepping up to what you have now Way better to be safe than sorry later