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I had a 63 Fairlane Sport Coupe that had the 289 "271" HP engine. Genuine K code car. Your right about the 5 bolt pattern.
These were high winding engines that could make serious HP.
Some one will get a good deal. Even if you have a 221/260, only takes a bore to make it a standard 289. These engines had a good cast material and were extremely strong.
just my 2 cents
Mark
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