<p>The real question is whether your ACT score will make you a strong candidate at the schools you are applying to. If it comes back and is less than what you were hoping for, EA may not be for you, you may be better served taking the ACT a second time and the SAT, and applying RD to your schools (unless you can get your scores in time for EA, that will be on a school by school basis). </p>
<p>Taking the ACT instead of the SAT does not put you at a disadvantage, nor does taking the SAT instead of the ACT put you at a disadvantage. Man, that myth just refuses to die!</p>