Suspension and steering help

Really the only things you need to do are:
* Replace those 'clapped out' bushings and joints. Check 'em. Don't assume good or bad. Sevice manual has the info needed for that. Wheel bearings readjust unless they show signs of damage.
* Install the factory handling package. Or go in logical steps considering the tires to be used. That would be larger t-bars, and a front sway bar first.
* New leaf springs if the current ones are worn out. I can't comment on those specific springs ather than the lengths seem to be correct for B-body.
For some comparison: Dodge Coronet, Charger and Super Bee Leaf Springs - Stengel Bros Inc.
* Rear sway bar last - too much rear roll stiffness can lead to trouble.
* Steering - Police type or 'firm feel' box for power steering.
* Set ride height and alignment. Use a little more negative camber than the factory recommendations. The FSM specs were based on tires with less grip, and assumed high crown roads.

That's really all you need.
Replacing worn out parts, installing a front sway bar, and good alignment will be the biggest changes you can make.

Consider this guy took his '68 RR to a track day.
Other than radial tires, its basically stock.
Not the best video, but thought the fact the guy drove it without issues for 20 minutes on a road course gives you some idea what the better factory packages are capable of.
https://board.moparts.org/ubbthread...others-stock-68-road-runner-at-track-day.html
from his brother who posted "...( and it's fully stock, BTW.. unrestored, drum brakes, manual steering, bench seat.. )..."
This year he went back. Only difference was a more performance oriented set of tires and rims, and fresh brake fluid.
https://board.moparts.org/ubbthread...nner-first-steps-what-shocks.html#Post2670606