I have a 1971 Blazer and I'm curious if your custom leaf springs already take into account the rear shackle flip pushing the rear axle forward about 1.5" ( commen problem on first gens) or is that some thing I need to address when ordering them and have the center pin location moved back? Also are the front springs a bit longer towards the rear to address the fact that most lift springs have the shackle straight up and down and not pointed back closer to 45* angle?