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Old 06/05/2003, 08:13 PM   #1

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GT/CS 289, engine swap

Hi, I've recently acquired a GT/CS mustang with a 289 4 barrel auto. The current engine unfortunately has had it after sitting in one place for over 20 years and needs replacement. Would it be a crime to replace the 289 with a 390 also from the same year? As I understand it the 390 was a option at this time. What sort of modifcations would be involved in installing this larger engine? upgrade for brakes, transmission I assume. Is it too much effort ? should I just replace it with another 289? Any advice appreciated.

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