Spring rate

Anyone have a chart or a listing of what the stock front and rear spring rates are?The rear springs in 73 scamp seem pretty shot because a transmission was stored in the trunk when I got it.So the springs were full on negative arch.I removed the transmission and the spare parts that were kept back in there and the springs are flat and dont have much arc to them.Pressing down they dont offer much resistance.If that soft squishy spring rate was what they came with I can see why they would be described as a tuna boat. So I'm just wondering the springs are just trashed or if they are supposed to be that soft.