Starting my 71 project

[JumboAMONGus]

im getting some chevelle rear springs and gonna cut the fronts will see what the rear malibu springs do first before i cut the fronts , was wondering on rear will i need adjustable track bar ? then its off to new set of heads since these ones im hopiong are cracked after driving truck for a year it started taking on water as much as 3 or 4 quarts in about 20minutes lol ,, and i changed head gaskets to make sure it wasnt blown , i know i should have had the heads checked ,, but getting some vortecs then off to body work cause by that time should be summer here ,,,