Are suspension parts differernt for a V-8 K frame and the slant 6 K frame?

If/when you go to buy your new t-bars, make sure they are clocked. They will be a right bar and a left bar.

This isn't necessary depending on the bar. The clocking is just to set the ride height, and stiffer bars need less clocking for the same height.

The Just Suspension 1" bars are not clocked, they're the same left to right (until you install them, once installed they should stay on that side).

There can be ride height issues depending on how the bars are clocked, I've heard complaints about Hotchkis' A body torsion bars and even PST's 1.03" bars not having enough adjustment to get the car back to stock ride height. With the JS 1" bars I was able to put the car pretty much at stock ride height. Granted, the adjusters were almost all the way in at that point. But since I run the car lowered a bit there was more than enough adjustment, I backed off the adjusters a little to put it where I wanted it.

This is a shot of my Duster with the 1" JS bars installed, and the ride height I had it set up at with some adjustment still available to raise the car. For reference, those are 225/60/15's.