Dropping a 390 into the engine bay of a 66 requires major reconstructive surgery - removal of the shock towers, revision of the entire front suspension etc. The 390 was not a factory option until 67 when the engine bay was made wider to accept it. I totally agree with everyone's advise of sticking with the 302/351 combo in this car.
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1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25
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