a while back i seen someone using trottlebodies from a motorcycle for his car
there cheaper to buy if you can find them used and another good thing is they usually have the linkages that can be adapted to work on a inline engine
according to the website you need to find those for a Suzuki GSXR 750, 1000, and 1300 (Hayabusa) ITB's up to '02 are the best for altering the spacing
the newer ones are paired together