1970 Plymouth Duster Valiant

I looked at the passenger side of the block and found these numbers: 25364305 and "3 . 31 . 67"

Here is what I see on the pad: D 440 (cross symbol) B and "7 31"

A Maltese Cross stamped on - engine numbering pad Fig. 45 indicates that engine is equipped with a crankshaft which has one or more connecting rods and/or main bearing journal finished .001 inch oversize. The position of the undersize journal or journals is stamped on a machine surface of the NO. 3 counterweight Fig. 46. A MALTESE CROSS followed by an X indicates that all connecting rod and main journals are .010 inch undersize. Connecting rod journals are identified by the letter "R’’ and main bearing journals by the letter ‘M." For example "M-1" indicates that NO. 1 main bearing is .001 inch undersize."

Maltese Cross .001" undersized bearing shells
Maltese Cross and X .010" undersized crankshaft