Torsion bar size?

Is .920 heavy enough for a 383 in a Duster?It's gonna be for street use.I know B-body uses this size for stock big-blocks.Also does the lower control arms need to be reinforced to carry the extra weight of the big-block.This is gonna be my first big-block A-body so i may have more questions as i get working on it.Right now i'm just gathering parts. :thumleft: