What is the best to upgrade A-body suspension?

from my six-cylinder cars to my V8 cars the most noticeable Improvement was putting polyurethane bushings in the front end upper/lower control arms and putting polyurethane shackle bushings only in the rear Leafs and using a rubber eyelet bushing 'the one in the front' I like to keep the road noise down that drones from the trunk..which is like a resonator/speaker box amplifying the noise. Much more responsive to the steering wheel movements..handled better, and didnt bottom out so easily on dips in the road...that was also because i chose a stiffer shock absorber than stock replacement. Felt solid and safer.
Now if you want a comfortable ride stay with a tall series Tire 70 series let's say.
What I ended up deciding on was keeping rubber in the strut rods... even with 6 cyl t bars....which are a softer more comfortable ride than 340 bars. ..they let it bounce more , travel further to take up the jolt to the drivers seat.