A Body Sway Bars

I'm running a qa1 front hollow sway bar. I haven't put a rear on yet. But I can say that the front alone made an amazing difference. I only have a set of competition engineering drag shocks with the stock pretty worn leaf springs in the rear but I don't experience a lot of body roll unless I'm really hammering down around a roundabout or a sharp corner. I think stiffer torsion bars and a rear sway bar would entirely eliminate that though.
I have a 76 dart fleet(cop car) rear sway bar on my 66 cuda, along with the 76 copcar t-bars. I never even installed the 76 frt sway bar because it was going to take some adapting, but also because a sl/6 4spd w/ HD t-bars and rear sway bar handles pretty good as is.
sorry, never auto-crossed, but I do drive in a spirited manner.