Which Cam?
http://cgi.ebay.com/ebaymotors/SB-CH...QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/COMP-...QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/COMP-...QQcmdZViewItem
Do not go as big as these guys are telling you at least not with stock compression and as far as the XFI recommendation BASED ON WHAT. See lots of guys recommending it and mostly mediocre times being delivered and lots of valvetrain problems.
You want to do a cam on a stock motor for now consider something like the GMPP846 or Comp 503 at the largest, it is not well recieved here but the "little" cams Crane 210/224, Lingenfelter 211/219 or 219/219 GMPP 845 really do make cars fast.
Stock heads ported are the right choice for most of us don't be so fast to assume you need aftermarket.
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BUT you really need to pick a direction and do your research first...
--Alan
The Best V8 Stories One Small Block at Time

