Lunati 60403 with Hughes 1110 spring???

Im getting ready to use the same parts. When i contacted lunati, I gave them the springs specs and they said they would do fine with the voodoo 268.

Now the Lunati springs have a spring rate of 363 lbs/in. Did you happen to find out at what lift this is? The Hughes is 310 lbs/in at .550" lift. Just curious if those numbers are comparable or not.