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Depending on what you are looking for, you should be fine with the 7 heads. The 7 heads are from a 71 and 7a's are from a 72. The 7a's definitely have hardened seats but I am not sure about the 7's. Both heads have small combustion chambers which is what you want. The 72 used dished pistons to lower the compression to 8.5. The use of flat top pistons will raise the compression which will be offset in part by the thicker head gaskets available today. Hope this helps.
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