well, questions like these have been answered so many times, try using the search engine. But to answer your question, a 351. But a hood scoop would probably be required for the extra aircleaner clearance, and you'd have to use shorty style heddman hedders. You could always stroke a 289 or whatever to gain cubic inches if you're really looking for size.
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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