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What ford 3.3 liter engine fits a 1985 T bird?

A 1985 Ford Thunderbird did *not* come with a 3.3L engine. The 1985 Thunderbird used either a 2.3L 4-cylinder or a 3.8L V6. There's no factory 3.3L option for that year. Swapping in a 3.3L would require significant modifications, and it's unlikely to be a straightforward process.