ITB for a 2387 build

[hscess]

well at first by looking at the simplicity of using the single throttle body for an NA motor looked good to me. Well it looks like its not a good idea for an NA motor, but good for turbo. So now I am looking into the motorcycle ITB. My motor build is a 2387 and was wonder which ITB will make the most HP. I was thinking GXR 1300. It wont be to hard for me to adapt them to a aluminum plate to match the CB- IDF manifolds. I know the spacing is off by 2mm I think, but I can work around that. I need to know any ideas on linkage also. Any help will be appreciated.