I have the FAST EZ EFI and love it. There are a bunch of throttle body EFI systems out there that utilize a wide band O2 sensor and self learning algorithms. Huge improvement over a carb if you can sort out the technical aspects.
Also, your intake manifold and exhaust system must be absolutely sealed and leak free. If a small air leak gets to the O2 sensor, the system goes haywire. My formula for success is the Remflex header gaskets & Percy's dead soft aluminum collector gaskets. Accept no substitutes.
Get it right and will have brilliant throttle response and instant starting.
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