Questions
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Title, description modification?
No, Google will not penalize you but then those changes will appear only afer Google crawls and indexes the page. In case Google finds your title & meta data of low quality, it can fetch it from Yahoo! directory or DMOZ (if you have your entry). In case you don't have it, it will use the first lines or the most related content on your page.
On-Page / Site Optimization | | IM_Learner0