If you plan to turbo it stay EFI as Zach says. Carburetion works OK for naturally aspirated engines (fuel ratios aren't that critical). Turbo engines, on the other hand, do very bad things when fuel ratios drop to even slightly too lean conditions. You will also need a good aftermarket ECU and the tuning skill not to slag the engine in the process. Check out MazdaTrix and Racing Beat's websites if you plan to go carbureted.
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