It may have a vin stamped on it and that may or may not be a complete, if it is that'll tell you exactly what it came out of. Also have a look at the machined pad up by the distributer for some more info and report back with your findings. In '74 I think they were all cast crank units but I could be mistaken.
The parts book show both a forged and cast crank for '74.
People will SWEAR they had a '74 with a forged crank but nobody has yet shown proof of one. Ever.
As far as I am concerned, if it was a '74 block, it was a cast crank.
I agree Stan, from a manufacturing standpoint they didn't set out to have 2 cranks available on purpose, if they had some leftovers maybe some early build cars had them. That is if they used forged in '73. Again, I could be wrong...
Should have a letter E after 440 on pad and a thick vibration dampener, but I agree 74 is a cast crank unless it was in front of a manual trans. 74 intake is a good piece just block EGR and make sure to use external balance t.c. or flexplate