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  1. Vintage Mustang Forum
    I have a 1977 Mustang II with the original 2.3L I4 w/ a 4 speed manual and I'm trying to determine the worth of swapping in a newer 2.3L I4 Ecoboost and a T5. I know its not usual to want to keep a I4, but I'm aiming for fuel economy as a more or less daily driver.
    1977 2.3 mustang 2
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