340 A Body Torsion Bars

What is the diameter of the factory stock 340 A body torsion bars? I think they are either .870 or .890, but I am not certain. I am going to use those, as I don't want something terribly stiff because I plan on running sway bars front and rear. Thanks.
.870 OEM 340 A body (318 A/C cars got the 340 bars)
.890 OEM 383 A body