[Stocker]

Not exactly what you were looking for, but a little info that may help.

Many years ago my '72 K20's front springs were sagging. I measured 7/8" to the bumpstops. Bought 2 1/2" Skyjacker Softrides and after installation I had 3 3/4" to the bumpstops, so about a 2 7/8" increase over the sagging OEM springs.

Couple of things to note: No need to replace the pitman arm with 2 1/2" springs. Brake hoses are also long enough. But the shocks are too short. Use stock rear shocks up front, they are the right length extended and compressed.

The kit I got came with rear blocks but I never used them. Truck sits nearly level, has maybe a very slight rake with the front just a tad higher than the back. I got used to it years ago and I like it that way.