ok guys, im not planning on lifting right away, but i am needing a plan for my 71 K-5. im thinking just a 4inch lift... how should i do it, should i go 4 inch shackle flip rear, then a 3 inch spring front? (to eliminate saggy-butt) or should i go shackle flip rear with 1" zero rate, and 4 inch spring front? all input helps.