I just bought a 84 k5 blazer. I'm looking to put a 6 in suspension lift and 3 in body lift with 39x15x16 superswampers. The motor is shot so I'm putting a new 350 in it.

Is there any problems I might run into when installing the suspension lift? I heard the drive shaft might be short but I'm not sure any help or ideas will be appreciated

 

I would contact the manufacturer of the kit you are purchasing. Some kits come with all of the necessary components while others require some modification to the driveshafts, etc. If a certain lift needs more work than what is offered in the kit, they should detail this work in their instructions.