It says LD4B on the front end and D4B on the back end? Can you take another pic where it says D4B to see if the L was ground off at some point in its life?
I saw that and it looks to be a casting error with the letter “L” being omitted. The bolt pattern and angle is 1966 and later as an LD4B would be as opposed to the early 64/65 D4B intake.
