Can anyone help decode a supposed 2.4E engine #? It is #6231264. My references indicate the 6= 6 cylinder, the 2= E spec, the 3= 1973, and the 1264 is the serial #. Correct?

My reference also indicates 584 '73 E coupes and 431 '73 E targas, or combined 1,015 '73 E's needing engines? If so, why would there be a 1264?