Agree cast. at a glance the cast will have thin line in it forged wide and the forged crank will ring if tapped with a blunt object like a hammer handle cast will sound like "Thud". If you search the threads there are pics of the two cranks.
I've never seen a Chrysler crank that didn't ring or hear one that made a thud, cast or forged. Must have been some really spectacular steel/nodular iron poured when they cast them.
