440 Crankshaft Question

[Nico Over <nover2@xxxxxxxxxxx>]

 I am doing a 440 build with my son, it is a 1978 Marine engine and is externally balanced. When we tried to install a flex plate, we found out that the 6 bolt pattern is different than a internally balanced steel crank.  I realize that I have to use externally balanced flex plate for this application but I would have thought that Ma Mopar would not have used a different bolt pattern between cast/steel crankshafts. If both patterns are the same then my marine 440 has a unique pattern. Can any list member confirm my conclusions? Thanks in advance.

Nico Over

Va. Beach, Va.

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