You have to pull the oil pan to look at the parting line running longitudinally, front to back, on the crank. Wide margin is forged, narrow is cast.

No telling otherwise. Too much time has gone by since new. Forged crank was new for 440 in 73, 71 for 383. Have bought 72 and older 440's that were serviced with cast cranks.

Tear into it.