Shocks: looking for Blistein quality at KYB price.

There’s nothing to “buy”, with radial tires and the physical world we inhabit these cars are substantially undersprung with factory torsion bars. There’s no equation or modern method of determining wheel rates for an application that will tell you your car is correctly sprung with the factory bars and a modern set of tires.

Your car, run it how you want. But your car IS undersprung, and it no doubt handles like it is.
Funny, I've driven plenty of cars, from 2009 Challenger, to Porche to Corvette. With 250,000 real world miles all over the country on early Barracudas I see no big difference between any new cars, performance cars, and my 66 Barracuda. The only improvement on my 66 Barracuda from stock 1966 Formula S suspension (original rear springs, sway bar, and torsion bars) are Bilstein shocks, a needle bearing idler arm, and a good alignment. Been running high performance radial tires since they came out, no big deal. Keep preaching your "new" wizbang gotta buy "supposed" improvements. Been there, done all that for decades, and I don't need them thank you. You want to road race or autocross, do what you want. I am just not interested in those endeavors.