Spring swap

[almostaranch2001]

Hi I have an opportunity to get some 4 inch lift springs from a1977 Blazer and was going to install them in a 1968 K10 half ton along with the axle . Does anyone know if the spring lengths are correct. I have been searching for spring lengths ans swaps and not having too much luck here or on the web. I do not know the manufacture of the lift from the blazer just yet and right now I have had no time to go make measurements. If anyone knows off the top of their head please let me know. I know the axle swap will work on the original springs but i would like to put in the lift at the same time