[HarryD]

FWIW.

My 1973.5 with 166,000 miles has a mostly stock suspension. A few upgrades were done a few years ago. I drive on the street for fun and autocross 5-8 times a year.

My suspension has turbo torsion bars (21 mm front/26 mm rear).
Front and rear 19 mm adjustable sway bars.
I replaced my rear spring plates bushes with neatrix parts. All other bushes are stock and original.
Bilstein HD fronts and Sport rears.
For the street I use 16x6 Fuchs with 205/55-16 Continental Extreme Contact Sport as tires and auto cross on 15x6 cookie cutters with Toyo RR 205/50-15 tires.

I had Rothsport lower/corner balance/align the car and apply his "secret sauce". Car rides and handles great.

One data point for your consideration.