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David,
Please look again closely at the marking–if it’s 662-J (as in Juliet), it fits all P-A 8s (including 836A) from 1933 through 1936. (1937-38 8s used 663M, which had a single set of points but also had a vacuum advance.) The 384 might be the unit’s serial number, which usually appears in the space on the ID tag following the model number. I don’t know of any Delco distributors of the period that would have the ‘384’ extension as part of the model number. The 662-J has dual ignition points and centrifugal advance only (no vacuum advance).
George