Well, the heads are of course the 351W, which later on was called the GT40 head, so they are not exactly horrible. Even the intake isn't horrible, but the cam used in the 351W is pretty mild, the factory 4V had the same cam as the 2V. The 289 HP had a much more aggressive cam, even the C9OZ-C hydraulic smallblock cam would be a huge improvement, could be done in one day, and you'd really like the results.
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