I have XHD's on my '74 Challenger. They are ok. No real complaints.

I had the 3800 lb automatic superstocks grafted onto my Volare for about 30 years. They did their job at the track, and I was surprised how well the car still handled. They never sagged. It was a little work to get the car to sit level from left to right. I had the complete police suspension on the Volare for a couple years and that handled really well. So I would know the difference.

I don't know why everyone bashes superstocks. There is more to suspensions and ride quality than springs alone.

Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!