1989 National Champion in SCCA Solo2 H Stock used a Shadow.

For it's class at the time, it could be made to be a very good handling car.
At the time, stock rules would have allowed unlimited front sway bar and shocks. Rear bar and springs factory only. Tires were probably yokohama A008 r compounds, but that's a guess.

Turbo econoboxes etc went into a quicker class, E or G Stock, I'd have to look again to see which. But they could be a source of components for your purposes.