The OP (Matt) has decided to go with an LS6 engine (383). Matt here is a supercharger that would work for your application.
http://www.whipplesuperchargers.com/...sp?ProdID=1230 I checked and Katech Oil squirters won't work for an LS6. Brian Thomson of Thomson automotive uses factory oil squirters, but I think they only work for Gen IV engines. Although, you can contact Brian to see if it will work for LS6. Anyway, good luck with your build.
Jeff