shocks for the street kyb or bilistein or qa1 or??

I won't settle for a non-gas shock. The pressurized shock reduces aeration of the damping fluid. This in turn provides a more uniform response over a larger range of high temperatures.

The 72 Demon has Monroe Gasmatics and the 73 Dart 4-door has Delco Pleasurizers (gas shock). The Monroes suit the raucous nature of the Demon, which is stiffly sprung and set up for canyon carving. The Delcos provide a pleasant, well-controlled ride on stock springs. They provide a well-controlled weight transfer when the car is stuffed into a decreasing radius corner (such as a freeway off-ramp).

I drive a lot of high-end metal, so I'm not going to tell you that either of these shocks is going to make your live axle A-body ride like an IRS German import. If you hit a sharp bump, the car is still going to want to hop sideways. But either set will settle the car down nicely and keep you in control.