The EMPI sway bar is fine. It will work as well as you could expect with this type of bar. The red neoprene bushings will last about 16k miles.
The best solution is a frame mounted bar that is anchored in a couple of places along the straight section. The bar itself does not move, but twist. I built one of these for my Spyder. Dannyp also built one. We both used 5/8" - 4130 steel bar.
What in the world is AFAIK?
I was really surprised when I watched a couple of install videos. I'd always assumed that the large bushings mounted to the beam and the smaller ones to the trailing arms. I've never seen a sway bar that just attached to the suspension L&R.
I imagine anchoring it to the beam would stiffen it a bit, but that's easily compensated for by using a smaller diameter bar.