Torsion bars

Fisher said

I took all the cast iron off of my 383 and put it on a scale I ended up with a savings of 125 lbs off the 383 with aluminum replacements. I am running a set of 340 bars, and the car rides like a dream and handles well for what i am doing. My duster is 3100 lbs with a full tank of gas and a big block, and full factory interior. Without me in it.

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Of coarse it will ride like a dream...that was the intent with cars being under sprung back in the day.
Picking your speed up or having to react to unseen circumstances is where you will get in to trouble and understeer off the road or just lose control.
Same with the old drum brakes.They are fine as long as you are stopping slowly as you come to a stop sign.