1974 was a transition year for Dodge going from the H.D. 413 motors in the larger M.H. and trucks to the 440-3 motors in the same year and chassis units. I've seen forged steel cranks with the H.D. six pak rods in 440-3 cast blocks and assembled in 1974 I've also seen the same series motors with cast cranks and dampeners in 1974 vehicles