I would not use a vortec head because a well prepped lump port will out flow it and bolt on. If I was going though the trouble I'd try a LS head first. The main issues with v8 head all the work involved and a shop or someone to help my be difficult. On a build like that there will challenges at every turn. We have been down that road many times over. The engines in Brazil are simple air pumps with a lot of Methonal,nitro and a huge turbo for boost. I have also spoken with the guys down there in Brazil.
