I saw a front spring perch replacement useing 1/4 inch x 2.1/2 x 5 inch block steel then forming a round section for the axel. apparently this is stronger and aslo gave about 3/4 inch lift it looked good. what would happen if 2 1/2 inch steel box was welded on top of the perch as a lift? ive heard it before to never lift the front with blocks. but forgive me i dont know what happens when you do this.