M code
From Galen Govier White book...........
#2946 729 LH / 1968-69 A body (B L) / 383-4 HP
#2863 900 RH / 1967-69 A body (B L) / 383-440 HP
#3462 017 LH / 1969 A body (B L) / 440 / A13 pkg
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