Putting 87 Blazer springs and axles under a 67 Long bed

[67custom4x4]

I am new to the board and have not been able to find any info on this with a search so I thought I would ask. I have a 87 K5 Blazer, and a 67 Long bed Pick up. I am wanting to put the 3/4 ton axles along with the leaf springs under my 3/4 ton 1967 long bed. Does anyone have any info on this mod. The reason I am wanting to do this mod is the lift kit for the 87 is half the price of the 67. And also the 87 already has a 4" Lift that I would like to have under my 67. I also have an extra set of 1/2 ton axles to go back under the blazer. Thanks for any info. that you guys have.