Zetec is the easiest.... Twin 45's but you will need a digital ignition to provide the spark. You may find that a simple non 3D ignition is available though it's pretty easy to get a 3D ignition set-up.

TBH... the same is going to be true for anything other than Dizzy OEM engines such as the Xflow, Pinto or early CVH.... and all of these are a complete generation behind the Zetec.

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