Yes the Formula S cars had uprated suspension. Not sure if that helped too much with a big block mounted up front though.
The 383 was rated at 280hp. This power level was down compared to the 325hp levels in other Chrysler models mainly because of the restrictive exhaust needed in the engine bay, which was still very tight despite being two inches wider than in the previous years model.
The 383 powered the Barracuda to mid 14s at 97mph on the drag strip.