Perhaps you can post the numbers off the engine pad and we can try to assisit.
Also may want to post pics of the trim tag for decodong?
1966 Impala SS
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Look for the last three numbers that are stamped here:
We can then tell what year and model vehicle the engine was produced for as well as induction (carburetors or TBI) and transmission type. This information is encoded in those three letters (they used two letters before 1967).