will replacing my orig spring raise the car. its so low i dont like to drive it .

 

Yes sagging springs was even common in the 70's. It was so common that adding air shocks was one of the most common mods on the car.

If you are not going for all original go with the multi leaf like the 68 SS had. If you are buying new mono-leaf springs, then take the weight off the springs for out of season storage. They will last longer.