Late sway bar to early A?

So I'm finally getting around to making some improvements to my wagon. We've been too busy driving it since we bought it. We've taken it on a few family trips, and while the car rides great when empty, load a family of five and a week's worth of luggage into it, and it is scary at freeway speeds. So, the first round of improvements are in the brakes and suspension.

This car doesn't need to out-stop or out-corner a Porsche, I just want it to be a nice driver. I have a '73 Scamp in the garage that is getting upgraded suspension and brakes, so I've got a lot of factory parts to use, if possible.

My plan for the wagon is to use the V8 torsion bars from the Scamp, and the anti-sway bar if possible. I know the later cars are wider, but will the sway bar work on the early body? If not what are my options? Was there a factory bar on the early cars? I've done a bit of research, but I haven't found anything other than massive aftermarket bars, which I don't want for this car.