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There isn't a bad set of FE heads. These are plain regular FE heads, nothing special about them. My book says 68.1 to 71.1cc chambers. Ports are close to 427 medium riser size. Valves are 2.02" / 1.55".
They're identical, except the D2 and later heads have induction hardened exhaust valve seats. You would need to have hardened seats put in your C8 heads.