Hot rod article showing stock Cleveland heads and some Trick Flow Cleveland style heads. Lord knows there is a LOT more power to be had if there were a better cam used in the article.
https://www.hotrod.com/articles/build-a-570hp-351-cleveland/amp/
But actually on a street motor you might want a bit less cam than they ran even.
Still by the time you factor in the additional displacement brought to the table by a 408 a pair of C heads on a clevor will be AWESOME!
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