The permissions depend on what sapi you're using with PHP also. If you're using CGI or FastCGI, you can tighten permissions down a bit more to 755. If you're using PHP as a dso (mod_php) you'll need to use 777 (and should look into another sapi for the security).
As for including the styles on another page if you include global.php and use vBulletin to power your other pages (home page for the forums, custom portal, whatever) it would be taken care of for you. If you just want to link to the CSS, I'm honestly not sure how you would accomplish that, as yes, the stylesheets are dynamic and the names change from what I've noticed on my forums.
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