need 70 k10 4x4 rear suspension info

[muddstir]

hello im new here and new to this body style of trucks. this january i bought a 70 chevy 1/2 4x4 looks alright on the outside and inside but the suspension looks frankensteinish. when the weather breaks this spring id like to get the mess cleaned up. my question is when these trucks came from the factory did they have any blocks under the rear leaf springs to make it sit level. i believe i read somewhere that they did but i cant confirm this. any info on this would be great thank you