Callies magnum are timken steel. The rest are all coolie steel. The Callies mopar magnum was the last high quality, reasonable cost, excellent machined, high power crank available. They could take 1500 hp in stride, and often more. There is no other option of that quality, for same money. I've seen Ohio, Scat, Eagle, all flex, and wipe out bearings from what a callies would have taken in stride.

Having to go to china for a crank, I'd go with Scat, since the machine work is better than the others.

Discarded fuel cranks are great, if you want to buy an adapter flywheel, run factory rod journals, and can use a splined snout (older press fits are not used anymore) and want only one or strokes to choose from.

All this is why there are so few good parts out there for a mope. Introduce something great, and get told a 904 head story, or a factory crank in a fuel car tale. Manufacturers must be insane to deal with old mopar stuff.