coil over suspension with stock K

I'm sure I will end up spending quite a bit more. there is just something cool about the 10 g mark. I use poly bushing throughout the entire suspension when I restored the car years ago. And I believe most of the tubular UCA's are longer in order to get better caster numbers.

Is a Track Bar really necessary for a solid axle suspension with leaf springs? Don't the leaf springs themselves keep the axle centered? or am I miss understanding the effect of the track bar.

At this point, maybe this is a conversation for a different thread.....