Ford never really did the whole 'numbers matching' bs that the other manufacturers are known for. However sometimes things do match like my '68 Mustang's C4 transmission has the exact same number stamped into it as the VIN (I think that is a fluke). But instead they put on the casting code as you have already found then near the casting number there will be some other numbers that designate the month/year your part was cast. Cast date numbers to be relatively close, but older then, the production date of your car.
-ron