I have an original early b-body anti-sway bar hanging up in the shop. I'd never bother to put it on car since it is very wimpy. Besides, the bushings are all shot in it and there isn't an easy way to replace them.

Cleanest setup is to use an aftermarket bar for a late 60's b-body as well as the matching lower control arms. That gives you a really nice setup that looks stock and works well.

Another option is to swap K-frames to a later style but then you're into the hassle of moving the engine back.

I covered this topic in my B-body book complete with pictures.