Would 4-door Valiant rear springs have more of an arch to them than ones from a 2-door? I put new springs on my car about three years ago and they never held the car up very well even thought they were supposed to be "+2" and I have longer shackles in the back. I just took them back off while offsetting the shackles, and noticed compared to the ones off my old 4-door parts car the old ones have a lot more arch to them laying side by side