Yes underrated, but in gross figures, not net. All in all, probably pretty accurate, maybe a little high. Those old 351's were 15sec cars. The 351 Cleveland was an engine that really hauled, but they add more expense and install problems.
You could spend your money and mod it up, or you could spend $500, pick up a solid running 5.0 HO and drop it in, and probably beat the pants off the 351. To boot the 5.0 will last, unlike the high compression high octane built for leaded fuel 351.
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