"What about the 351? Very little is said about its performance potential when compared to the 428. However, the 351 was the meat-and-potatoes engine that bore the brunt of the commuter responsibility. When the new-for-'69 351 Windsor came out, it was a welcome "upgrade" from the 302 4V of the '68 GT. It also was largely in response to the 350 that was available with the Camaro. With a 1-inch-taller deck height, it was something more than the 302 it replaced, but shared many commonalities. A year later, the Windsor took a back seat to the new '70 351 Cleveland. The canted valve engine was a departure from the small-block design that had debuted in 1962 as a 221-cid 2V. It boasted more power than the 351 Windsor and developed a well-deserved reputation for performance."

Sources: Pulled this from Mustang Monthly Magazine.

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