Are /6 torsion bars the same as 318?

I'll side with Bill on this. Going to stiffer springs is not necessarily the way to handling happiness. Stiffer springs will cause the ride to be rougher. Softer springs don't necessarily mean a floating ride if stiffer shocks are part of the package. The handling challenge for a street car is to keep the tires stuck to the pavement while controlling body motions. What constitutes acceptable is going to vary from person to person.

I've found that the anti-roll bar limits the travel of the Mopar front end, especially on the downstroke or rebound. All the same, I prefer to have at least a front bar as thick as I can find.

According to a myriad of build sheets I have seen, 225 cars with factory A/C had the same T-bars as 318s w/o A/C. I've seen 318 cars w/ A/C using 340 T-bars. All the 340 cars I've seen, w/ & w/o factory A/C, had the same T-bars.