How much gap between bump stop and top of axle mount?

[hemi43]

I'm trying to find out how much of a gap there's supposed to be on a stock height Blazer. I kinda knew my springs were going to need replacing, but didn't realize how bad they were until I set my Blazer on the ground once the engine was in. You can also see how much my shock is compressed.
Are the springs supposed to be flat with the truck on the ground? Mine arch upwards.
I'd like to get new springs, but another concern is bump steer if I go up a couple inches.