If you believe you can improve your GMAT score by 40+ points, I recommend you take the test again. Your score is self-reported on your business school application, so admissions teams will focus on your highest score.
Here is some school specific advice for HBS: http://www.stacyblackman.com/business-s ... ss-school/
Conrad and the Stacy Blackman
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap