The Koni SPA-1 worked the best on my old Duster street and strip car.
I'm not sure if you can still buy them new or not now but they made a heck of a difference on my car when I finally tried them, went from 1.54 to 1.52 60 ft. times down 1.42 with the same tires at the same track two week later
The Koni SPA-1 are speed sensing as well as adjustable if needing additional control for excellent to bad tracks, I put mine on out of the box and never needed to touch them after that
That car went 9.993 at 134.+ MPH in the 1/4 mile through the 3.0 inch full exhaust system with the air cleaner on Lots of fun, the bad thing was I couldn't get any local to street racer to race me in that car
BTW, I had to buy the B body front shocks as Koni didn't omake them for the 1967 to 1976 A bodies cars in the mid 2000s, I probably bought them in 2007.