Not a big fan of steel cranks, I've had 'em break too many times. Two Fords, one Dodge, one IHC. Cast would have pounded out too, but wouldn't have snapped and taken out the block at the same time. I still use 'em if the engine has one, but I won't go out of my way to get one.
A 340 can be made to use a 360 crank, 372 cubes fairly inexpensively.