90_Mustang_GT

This last weekend I replaced all the suspension. It looks like whoever had the car before me heated up the coil springs and lowered the car rather than buying a lowering kit. Biggest problem is when I back up the tires bow real bad.The tops come in and the bottom out.When driving the tires look fine.It has a new rack and pinion, tie rods and ends. I thought mayb putting new springs on it would fix the problem, but it didn't. Whoever put it in mayb not put the ends on right or mayb not get it alligned after the put the rack and pinion on? It needs alligned anyways with the new suspension. Advice??