The combustion chambers are smaller too
Nominal chamber volumes
1970 Boss 302 = 58cc
1970 351C 4V = 63cc
1971 351C 4V = 66cc
In my opinion it would be a shame to bugger up the Boss 302 heads by adapting them to the 351C. Cleveland parts are a dwindling resource, Boss 302 parts are even moreso.
-G
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