Not Ranked
I think you have to say the 221 was the engine that started the whole thing. It was the engine that made Shelby contact Ford and AC. It was the engine that was first shipped to England, the first fitted into and driven by AC , the first that made everyone think it was possible and fitted first into what became CSX2000, and yes the first to removed and upgraded by the 260. A lot of firsts enough that I think it should be included in the lineup of Shelby engines.
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