Taking apart the 68

[RIDDLA]

The front end is off the bed is off not bad for two hours off messing around with it. The problem is that i wanted to do the front end suspension new ball joints, tie rods, shocks. The truck has rake that i dont like so i was thinking on taking off some leaf springs from the rear end. How much do you think i can lower the back by doing this? i also have a bad transmission mount thats been the cause of broken u jionts i think. but im looking for shacles for the rear who sells good ones?
Thanks for reading feel free to express yourselfs lol Riddla