Torsion Bars?

DentalDart said
Wheels 15×7 steelies with 245/60 rear cooper radials and 225/60 fronts.
Shocks KYB
How I drive the car? To get donuts with my daughter doing burnouts around the corner (she loves when we spin the tires ha). Mostly just regular to and from daily driving to different places with a little spirited driving sprinkled in.

No track days for me.

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The fresh steelies look fantastic.
I gather that the Cooper Cobra tires are just about the same as he BFG Radial T/A and the MT Sportsman ST(?), they're all all-season tires...but they look sharp. My father has a brand new set on his '67 GTX (white letters in) and I think they look better than my BFGs. I hope they perform well for you!

Johnny Dart said
Going to the grocery story, doing burnouts ?
As long as they are clean, with no nicks, run the Mopar 340 bars until they prove you wrong.

DentalDart said
Yea my daughter thinks it's the best thing ever when we punch the gas from a stop. The smile on her face is contagious when we let it rip.

Ha! That's great. You're raising that kid right! :D
It doesn't sound like you need a super stiff bar. I tend to agree with Johnny Dart on this one. The stock 340 bars would probably be just fine. He makes a good point about the bars being free of nicks. The vast majority of the stresses on these bars is carried on the very outer portion. A nick or a gouge could lead to a failure.

I will also just add that a lot of people have pointed out that even the "performance" bars from back then are much more softly sprung than we're used to from modern cars. If you're replacing them, maybe go a notch or two more stiff. I have 1.14" bars in mine. They're on the stiff side but even these are not uncomfortable (paired with Fox/Hotchkis shocks) IMO.