At this time, most schools are not including the IR score as part of their evaluation. The reason being is that there is not enough data yet to correlate performance on IR with performance in business school. The other concern is your low quant score. Sorry to be the bearer of bad news, but I think you'll need to take the GMAT again to have a realistic shot at those schools (unless you have some truly outstanding work experience--like you started a $10million company or something like that.)
I 100% agree with Ward. Your score is far below the mark that you'll need to be truly competitive at these schools. Yes it's great that you got an 8 on the IR, but you should interpret that as meaning "I can do even better on the GMAT next time!" MIT in particular is supposedly quite GMAT obsessed. Stanford might be more open to your story, but you want to give them reasons to admit you, not to deny you, and right now your GMAT score is a good enough reason to say sorry, try again.
Blogging about the MBA application process. Because I need to do something with all this bschool energy.
http://www.mybreakaway.com/ Recent post: September 20, "Transitions"
Yale School of Management MBA Candidate, 2015.