I still dont like this idea.Has anyone ever used one of these with sucess?
Drilling Fixture (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2436834063&category=43991)

You don't want to do this. :(
The resulting mis-match between the intake port on the Vortec head and a "standard" intake manifold defeats the performance gain you've set out to achieve.
You could buy the correct intake for that price! :eek:

Big No No on drilling the Vortec heads.Port shape differs, port height differs, etc.