Numbers and Letters: V.I.N./Fender Tag/Engine Stamp.

O.K. here's my question, On my 68 300, the V.I.N.# is CM43K8C274548,Fender Tag, bottom# is CM43815614027, I was of the understanding these #'s were suppose to be the same, and then there is the stamped # on the motor, behind oil pan by the starter, on the machined surface, this # is 440P 24341089. Not sure when the V.I.N. was stamped on the block think it was 68,maybe 67. Why don't any of these numbers coincide? Any help would be appreciated. Thx. All.
Author: BigCRig