i agree, she shouldnt be missing or boggin down with a 750. unless its fucking drag carb. more than likely the jet kit is causeing it to stumble, fuck the gas milage, shit its under 2 bucks anyway. also try running high tess in it and see how she reacts compared to reg if your not already. msd set up is like he said very expensive but dont get me wrong there top of the line for a reason. and dont worrie to much about not being able to match it up. give napa or advanced your specs and there shud be a direct replace for it