Will These Heads Fit my 273?

EmersonC said

Do you know what years of 318 heads will work? I found some on ebay that look good, casting number 4027163 from 1984.

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Those are the previous incarnation of the famed "302" heads of 1985-92?...they work but, IMHO, they aren't as good as the later 302's. They are open chamber heads...302's are closed, heart-shaped, high-swirl chambers.