Date code is 1970 and the pad is C440? It can't be, you have mis-read one or the other. C440 is 1967. F440 is 1970.
Either year, if it is the original crank to the block, it's forged.
To check for forged, if the crank is out of the block, tap it with a hammer to see if it rings or look for the wide (1/4"-3/8") parting line