Jeff,
The harmonic balancer is NOT matched to your engine. It is balanced
separately and just driven on and bolted fast. My 1965 parts book shows
that the same part # is used for all 361, 383, 413, and 426W engines.
Plus the number shows that the part is old (even in 65). You should
have no trouble replacing your balancer with a used part.
Pete in PA
loves 62 LeBarons