Olive Loaf/ A fresh start. Target low 12's

[Witt1962]

Hello Guys,
It has been a while since I posted. This 1970 truck had to be put on hold for a couple of reasons, first I picked up a Camaro. The Camaro project took all my spare time and money.
Now it's time to start the truck.
The goal is to run low 12's and still use it as a truck. It will not be a daily driver. However it will have to tow at times.
1.) I need some expertise on setting up the back half of the truck.
2.) I have a 56 inch wide Dana 60, 4:10 gear. Power-lock. 2 inch lowering block.
3.) I need help on which rear springs and do I need to move the front attachment point on the control arms?
4.) What bushings or ball mounts on the control arms.
5.) I will use a 12 inch wheel and soft tires on track days.
Any rear spring and control arm ideas are appreciated!
Cheers. David