Is this a symptom of worn out torsion bars?

I agree with C130 Chief. My 68 Barracuda had a \6 but also had the heavy duty suspension so the bars were base v8 .850 diameter. They were all together to soft a rate and would bottom over most any bump even with the ride height cranked up, can't imagine what it would have been like with base \6 bars.

In preperation for a future v8 swap I put in .890 big block bars when I did the disk brake swap. These bars were perfect for the slant six, eliminated the bottoming, firmed up the ride to be equivalent to modern car ride and made the car handle dramtically better.

Now with the 360 installed the ride is still firm and the car does not bottom out but the handling degraded some. I installed a 1 1/8" sway bar that cured the increased body roll in corners.